added IBaseAssignmentExpression and made IComponentAssigntExpression to sit on...

added IBaseAssignmentExpression and made IComponentAssigntExpression to sit on top of IBaseAssignmentExpression rather than IAssignmentExpression

src/Compilers/Core/Portable/Generated/Operations.xml.Generated.cs

@@ -366,7 +366,7 @@ public LazyArrayInitializer(Lazy<ImmutableArray<IOperation>> elementValues, bool
     /// <summary>
     /// Represents an assignment expression.
     /// </summary>
-    internal abstract partial class BaseAssignmentExpression : Operation, IAssignmentExpression
+    internal abstract partial class BaseAssignmentExpression : Operation, IBaseAssignmentExpression
     {
         protected BaseAssignmentExpression(OperationKind kind, bool isInvalid, SyntaxNode syntax, ITypeSymbol type, Optional<object> constantValue) :
             base(kind, isInvalid, syntax, type, constantValue)

src/Compilers/Core/Portable/Operations/IAssignmentExpression.cs

@@ -5,13 +5,13 @@
 namespace Microsoft.CodeAnalysis.Semantics
 {
     /// <summary>
-    /// Represents an assignment expression.
+    /// Represents a base interface for assignment expressions.
     /// </summary>
     /// <remarks>
     /// This interface is reserved for implementation by its associated APIs. We reserve the right to
     /// change it in the future.
     /// </remarks>
-    public interface IAssignmentExpression : IOperation
+    public interface IBaseAssignmentExpression : IOperation
     {
         /// <summary>
         /// Target of the assignment.
@@ -22,5 +22,16 @@ public interface IAssignmentExpression : IOperation
         /// </summary>
         IOperation Value { get; }
     }
+
+    /// <summary>
+    /// Represents an assignment expression.
+    /// </summary>
+    /// <remarks>
+    /// This interface is reserved for implementation by its associated APIs. We reserve the right to
+    /// change it in the future.
+    /// </remarks>
+    public interface IAssignmentExpression : IBaseAssignmentExpression
+    {
+    }
 }
 

src/Compilers/Core/Portable/Operations/ICompoundAssignmentExpression.cs

@@ -11,7 +11,7 @@ namespace Microsoft.CodeAnalysis.Semantics
     /// This interface is reserved for implementation by its associated APIs. We reserve the right to
     /// change it in the future.
     /// </remarks>
-    public interface ICompoundAssignmentExpression : IAssignmentExpression, IHasOperatorMethodExpression
+    public interface ICompoundAssignmentExpression : IBaseAssignmentExpression, IHasOperatorMethodExpression
     {
         /// <summary>
         /// Kind of binary operation.