Set KotlinCompilerVersion.IS_PRE_RELEASE = true

Since master is now 1.4-M1, and 1.4 is a pre-release version.

core/util.runtime/src/org/jetbrains/kotlin/config/KotlinCompilerVersion.java

@@ -27,7 +27,7 @@ public class KotlinCompilerVersion {
     // Binaries produced by this compiler with that language version (or any future language version) are going to be marked
     // as "pre-release" and will not be loaded by release versions of the compiler.
     // Change this value before and after every major release
-    private static final boolean IS_PRE_RELEASE = false;
+    private static final boolean IS_PRE_RELEASE = true;
 
     public static final String TEST_IS_PRE_RELEASE_SYSTEM_PROPERTY = "kotlin.test.is.pre.release";