Make anonymous classes for callable references synthetic

#KT-28453 Fixed

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

@@ -435,6 +435,11 @@ public class AsmUtil {
         return InlineUtil.isInlineOrContainingInline(descriptor.getContainingDeclaration()) ? ACC_PUBLIC : NO_FLAG_PACKAGE_PRIVATE;
     }
 
+    public static int getSyntheticAccessFlagForLambdaClass(@NotNull ClassDescriptor descriptor) {
+        return descriptor instanceof SyntheticClassDescriptorForLambda &&
+               ((SyntheticClassDescriptorForLambda) descriptor).isCallableReference() ? ACC_SYNTHETIC : 0;
+    }
+
     public static int calculateInnerClassAccessFlags(@NotNull ClassDescriptor innerClass) {
         int visibility =
                 innerClass instanceof SyntheticClassDescriptorForLambda
@@ -443,6 +448,7 @@ public class AsmUtil {
                   ? ACC_PUBLIC
                   : getVisibilityAccessFlag(innerClass);
         return visibility |
+               getSyntheticAccessFlagForLambdaClass(innerClass) |
                innerAccessFlagsForModalityAndKind(innerClass) |
                (innerClass.isInner() ? 0 : ACC_STATIC);
     }

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

@@ -142,13 +142,14 @@ public class ClosureCodegen extends MemberCodegen<KtElement> {
             sw.writeInterfaceEnd();
         }
 
-        v.defineClass(element,
-                      state.getClassFileVersion(),
-                      ACC_FINAL | ACC_SUPER | visibilityFlag,
-                      asmType.getInternalName(),
-                      sw.makeJavaGenericSignature(),
-                      superClassAsmType.getInternalName(),
-                      superInterfaceAsmTypes
+        v.defineClass(
+                element,
+                state.getClassFileVersion(),
+                ACC_FINAL | ACC_SUPER | visibilityFlag | getSyntheticAccessFlagForLambdaClass(classDescriptor),
+                asmType.getInternalName(),
+                sw.makeJavaGenericSignature(),
+                superClassAsmType.getInternalName(),
+                superInterfaceAsmTypes
         );
 
         initDefaultSourceMappingIfNeeded(context, this, state);

compiler/backend/src/org/jetbrains/kotlin/codegen/PropertyReferenceCodegen.kt

@@ -92,7 +92,9 @@ class PropertyReferenceCodegen(
         v.defineClass(
             element,
             state.classFileVersion,
-            ACC_FINAL or ACC_SUPER or AsmUtil.getVisibilityAccessFlagForClass(classDescriptor),
+            ACC_FINAL or ACC_SUPER or
+                    AsmUtil.getVisibilityAccessFlagForClass(classDescriptor) or
+                    AsmUtil.getSyntheticAccessFlagForLambdaClass(classDescriptor),
             asmType.internalName,
             null,
             superAsmType.internalName,