Support `external` modifier on classes in descriptor renderer. Regenerate test data.

compiler/testData/diagnostics/testsWithJsStdLib/native/nativeGetter/onNativeClassMembers.txt

 package
 
-public final class A {
+public external final class A {
     public constructor A()
     public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
     @kotlin.js.nativeGetter public final fun foo(/*0*/ a: kotlin.Double): kotlin.String?
@@ -20,7 +20,7 @@ public final class A {
     }
 }
 
-public final class B {
+public external final class B {
     public constructor B()
     @kotlin.js.nativeGetter public final val foo: kotlin.Int = 0
     public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
@@ -50,7 +50,7 @@ public final class B {
     }
 }
 
-public final class C {
+public external final class C {
     public constructor C()
     @kotlin.js.nativeGetter public final fun bar(/*0*/ a: kotlin.String): kotlin.Int
     @kotlin.js.nativeGetter public final fun baz(/*0*/ a: kotlin.String = ...): kotlin.Int?

compiler/testData/diagnostics/testsWithJsStdLib/native/nativeGetter/onNestedDeclarationsInsideNativeClass.txt

 package
 
-public final class A {
+public external final class A {
     public constructor A()
     public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
     public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int

compiler/testData/diagnostics/testsWithJsStdLib/native/nativeInvoke/onNativeClassMembers.txt

 package
 
-public final class A {
+public external final class A {
     public constructor A()
     @kotlin.js.nativeInvoke public final val foo: kotlin.Int = 0
     public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean

compiler/testData/diagnostics/testsWithJsStdLib/native/nativeInvoke/onNestedDeclarationsInsideNativeClass.txt

 package
 
-public final class A {
+public external final class A {
     public constructor A()
     public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
     public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int

compiler/testData/diagnostics/testsWithJsStdLib/native/nativeSetter/onNativeClassMembers.txt

 package
 
-public final class A {
+public external final class A {
     public constructor A()
     public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
     @kotlin.js.nativeSetter public final fun foo(/*0*/ a: kotlin.Int, /*1*/ v: kotlin.String): kotlin.Unit
@@ -24,7 +24,7 @@ public final class A {
     }
 }
 
-public final class B {
+public external final class B {
     public constructor B()
     @kotlin.js.nativeSetter public final val foo: kotlin.Int = 0
     public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
@@ -54,7 +54,7 @@ public final class B {
     }
 }
 
-public final class C {
+public external final class C {
     public constructor C()
     public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
     @kotlin.js.nativeSetter public final fun foo(/*0*/ a: kotlin.Number, /*1*/ v: kotlin.String = ...): kotlin.String

compiler/testData/diagnostics/testsWithJsStdLib/native/nativeSetter/onNestedDeclarationsInsideNativeClass.txt

 package
 
-public final class A {
+public external final class A {
     public constructor A()
     public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
     public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int

compiler/testData/diagnostics/testsWithJsStdLib/native/nested.txt

@@ -22,7 +22,7 @@ public final class TopLevel {
     public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
     public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
 
-    public final class A {
+    public external final class A {
         public constructor A()
         public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
         public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
@@ -37,7 +37,7 @@ public final class TopLevel {
     }
 }
 
-public final class TopLevelNative {
+public external final class TopLevelNative {
     public constructor TopLevelNative()
     public final val x: kotlin.String = "a"
     public external final val y: kotlin.String
@@ -49,7 +49,7 @@ public final class TopLevelNative {
     public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
     public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
 
-    public final class A {
+    public external final class A {
         public constructor A()
         public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
         public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int

compiler/testData/diagnostics/testsWithJsStdLib/native/optionlBody/native.txt

@@ -8,7 +8,7 @@ public external fun foo(): kotlin.Unit
 public external fun kotlin.String.bar(): kotlin.Int
 public external fun kotlin.String.foo(): kotlin.Int
 
-public final class C {
+public external final class C {
     public constructor C()
     public final val baz: kotlin.Int
     public final val boo: kotlin.Int
@@ -30,7 +30,7 @@ public final class C {
     }
 }
 
-public object O {
+public external object O {
     private constructor O()
     public final val baz: kotlin.Int
     public final val boo: kotlin.Int
@@ -41,7 +41,7 @@ public object O {
     public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
 }
 
-public interface T {
+public external interface T {
     public abstract val baz: kotlin.Int
     public open fun bar(): kotlin.Unit
     public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean

compiler/testData/diagnostics/testsWithJsStdLib/native/optionlBody/nativeGetter.txt

@@ -3,7 +3,7 @@ package
 @kotlin.js.nativeGetter public fun kotlin.String.bar(/*0*/ n: kotlin.Int): kotlin.Int?
 @kotlin.js.nativeGetter public fun kotlin.String.foo(/*0*/ n: kotlin.Int): kotlin.Int?
 
-public interface T {
+public external interface T {
     @kotlin.js.nativeGetter public open fun bar(/*0*/ d: kotlin.Double): kotlin.String?
     public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
     @kotlin.js.nativeGetter public abstract fun foo(/*0*/ d: kotlin.Double): kotlin.String?

compiler/testData/diagnostics/testsWithJsStdLib/native/optionlBody/nativeInvoke.txt

@@ -3,7 +3,7 @@ package
 @kotlin.js.nativeInvoke public fun kotlin.String.bar(): kotlin.Int
 @kotlin.js.nativeInvoke public fun kotlin.String.foo(): kotlin.Int
 
-public object O {
+public external object O {
     private constructor O()
     @kotlin.js.nativeInvoke public final fun bar(): kotlin.Unit
     public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean

compiler/testData/diagnostics/testsWithJsStdLib/native/optionlBody/nativeSetter.txt

@@ -3,7 +3,7 @@ package
 @kotlin.js.nativeSetter public fun kotlin.String.bar(/*0*/ n: kotlin.Int, /*1*/ v: kotlin.Any): kotlin.Unit
 @kotlin.js.nativeSetter public fun kotlin.String.foo(/*0*/ n: kotlin.Int, /*1*/ v: kotlin.Any): kotlin.Unit
 
-public final class C {
+public external final class C {
     public constructor C()
     @kotlin.js.nativeSetter public final fun bar(/*0*/ d: kotlin.Double, /*1*/ v: kotlin.Any): kotlin.Any
     public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean

compiler/testData/diagnostics/testsWithJsStdLib/native/rtti/castToNativeInterface.txt

@@ -2,7 +2,7 @@ package
 
 public fun box(/*0*/ a: kotlin.Any, /*1*/ b: kotlin.Any): kotlin.Pair<I, I?>
 
-public interface I {
+public external interface I {
     public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
     public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
     public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String

compiler/testData/diagnostics/testsWithJsStdLib/native/rtti/checkForNativeInterface.txt

@@ -2,7 +2,7 @@ package
 
 public fun box(/*0*/ a: kotlin.Any, /*1*/ b: kotlin.Any): kotlin.Boolean
 
-public interface I {
+public external interface I {
     public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
     public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
     public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String

compiler/testData/diagnostics/testsWithJsStdLib/native/rtti/nativeInterfaceAsReifiedTypeArgument.txt

@@ -4,14 +4,14 @@ public fun bar(): kotlin.Unit
 public inline fun </*0*/ reified T> foo(/*0*/ x: T): kotlin.Unit
 public operator inline fun </*0*/ reified T> C.plus(/*0*/ other: T): C
 
-public final class C : I {
+public external final class C : I {
     public constructor C()
     public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
     public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
     public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
 }
 
-public interface I {
+public external interface I {
     public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
     public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
     public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String

compiler/testData/diagnostics/testsWithJsStdLib/native/rtti/whenIsNativeInterface.txt

@@ -2,13 +2,13 @@ package
 
 public fun box(/*0*/ a: kotlin.Any): kotlin.Int
 
-public interface I {
+public external interface I {
     public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
     public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
     public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
 }
 
-public interface J {
+public external interface J {
     public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
     public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
     public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String

compiler/testData/diagnostics/testsWithJsStdLib/native/unusedParam/native.txt

@@ -3,7 +3,7 @@ package
 public external fun foo(/*0*/ a: kotlin.String): kotlin.Int
 public external fun kotlin.Int.foo(/*0*/ a: kotlin.String): kotlin.Int
 
-public final class Bar {
+public external final class Bar {
     public constructor Bar(/*0*/ b: kotlin.Int, /*1*/ c: kotlin.Char)
     public final fun baz(/*0*/ d: kotlin.Int): kotlin.Unit
     public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
@@ -11,7 +11,7 @@ public final class Bar {
     public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
 }
 
-public object Obj {
+public external object Obj {
     private constructor Obj()
     public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
     public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int

compiler/testData/diagnostics/testsWithJsStdLib/native/unusedParam/nativeGetter.txt

@@ -2,7 +2,7 @@ package
 
 @kotlin.js.nativeGetter public fun kotlin.Int.foo(/*0*/ a: kotlin.String): kotlin.Int?
 
-public final class Bar {
+public external final class Bar {
     public constructor Bar(/*0*/ b: kotlin.Int, /*1*/ c: kotlin.Char)
     @kotlin.js.nativeGetter public final fun baz(/*0*/ d: kotlin.Int): kotlin.Any?
     public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
@@ -10,7 +10,7 @@ public final class Bar {
     public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
 }
 
-public object Obj {
+public external object Obj {
     private constructor Obj()
     public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
     public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int

compiler/testData/diagnostics/testsWithJsStdLib/native/unusedParam/nativeInvoke.txt

@@ -2,7 +2,7 @@ package
 
 @kotlin.js.nativeInvoke public fun kotlin.Int.foo(/*0*/ a: kotlin.String): kotlin.Int
 
-public final class Bar {
+public external final class Bar {
     public constructor Bar(/*0*/ b: kotlin.Int, /*1*/ c: kotlin.Char)
     @kotlin.js.nativeInvoke public final fun baz(/*0*/ d: kotlin.Int): kotlin.Unit
     public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
@@ -10,7 +10,7 @@ public final class Bar {
     public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
 }
 
-public object Obj {
+public external object Obj {
     private constructor Obj()
     public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
     public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int

compiler/testData/diagnostics/testsWithJsStdLib/native/unusedParam/nativeSetter.txt

@@ -2,7 +2,7 @@ package
 
 @kotlin.js.nativeSetter public fun kotlin.Int.foo(/*0*/ a: kotlin.String, /*1*/ v: kotlin.Int): kotlin.Int
 
-public final class Bar {
+public external final class Bar {
     public constructor Bar(/*0*/ b: kotlin.Int, /*1*/ c: kotlin.Char)
     @kotlin.js.nativeSetter public final fun baz(/*0*/ d: kotlin.Int, /*1*/ v: kotlin.Int): kotlin.Unit
     public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
@@ -10,7 +10,7 @@ public final class Bar {
     public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
 }
 
-public object Obj {
+public external object Obj {
     private constructor Obj()
     public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
     public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int

compiler/testData/diagnostics/testsWithJsStdLib/native/wrongTarget.txt

@@ -3,7 +3,7 @@ package
 public val x: kotlin.Int
 public val B.x: kotlin.Int
 
-public final annotation class A : kotlin.Annotation {
+public external final annotation class A : kotlin.Annotation {
     public constructor A()
     public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
     public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int

core/descriptors/src/org/jetbrains/kotlin/renderer/DescriptorRendererImpl.kt

@@ -903,6 +903,7 @@ internal class DescriptorRendererImpl(
             if (!isEnumEntry) {
                 renderVisibility(klass.visibility, builder)
             }
+            renderExternal(klass, builder)
             if (!(klass.kind == ClassKind.INTERFACE && klass.modality == Modality.ABSTRACT ||
                   klass.kind.isSingleton && klass.modality == Modality.FINAL)) {
                 renderModality(klass.modality, builder)