SYNTHETIC flag for internal members

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

@@ -212,7 +212,7 @@ public class AsmUtil {
             flags |= ACC_ABSTRACT;
         }
 
-        if (JetTypeMapper.isAccessor(functionDescriptor)) {
+        if (JetTypeMapper.isAccessor(functionDescriptor) || functionDescriptor.getVisibility() == Visibilities.INTERNAL) {
             flags |= ACC_SYNTHETIC;
         }
 

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

@@ -331,6 +331,10 @@ public class PropertyCodegen {
             modifiers |= ACC_PRIVATE;
         }
 
+        if (propertyDescriptor.getVisibility() == Visibilities.INTERNAL) {
+            modifiers |= ACC_SYNTHETIC;
+        }
+
         if (AsmUtil.isPropertyWithBackingFieldCopyInOuterClass(propertyDescriptor)) {
             ImplementationBodyCodegen parentBodyCodegen = (ImplementationBodyCodegen) memberCodegen.getParentCodegen();
             parentBodyCodegen.addCompanionObjectPropertyToCopy(propertyDescriptor, defaultValue);