Skip annotation classes in $DefaultImpls method delegation logic

Annotation could be safely skipped (as already interfaces) cause
  compiler generates delegation to DefaultImpls only for classes

compiler/backend/src/org/jetbrains/kotlin/codegen/ImplementationBodyCodegen.java

@@ -1426,7 +1426,7 @@ public class ImplementationBodyCodegen extends ClassBodyCodegen {
     }
 
     private void generateTraitMethods() {
-        if (isInterface(descriptor)) return;
+        if (isJvmInterface(descriptor)) return;
 
         for (Map.Entry<FunctionDescriptor, FunctionDescriptor> entry : CodegenUtil.getNonPrivateTraitMethods(descriptor).entrySet()) {
             FunctionDescriptor interfaceFun = entry.getKey();