Generate private constructor for object

#KT-9510 Fixed

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

@@ -365,7 +365,7 @@ public class AsmUtil {
 
         // the following code is only for PRIVATE visibility of member
         if (memberDescriptor instanceof ConstructorDescriptor) {
-            if (isNonCompanionObject(containingDeclaration) || isEnumEntry(containingDeclaration)) {
+            if (isEnumEntry(containingDeclaration)) {
                 return NO_FLAG_PACKAGE_PRIVATE;
             }
             if (isEnumClass(containingDeclaration)) {

compiler/backend/src/org/jetbrains/kotlin/codegen/context/CodegenContext.java

@@ -395,8 +395,7 @@ public abstract class CodegenContext<T extends DeclarationDescriptor> {
     }
 
     public void recordSyntheticAccessorIfNeeded(@NotNull CallableMemberDescriptor descriptor, @NotNull BindingContext bindingContext) {
-        if (hasThisDescriptor() &&
-            (descriptor instanceof ConstructorDescriptor || Boolean.TRUE.equals(bindingContext.get(NEED_SYNTHETIC_ACCESSOR, descriptor)))) {
+        if (hasThisDescriptor() && Boolean.TRUE.equals(bindingContext.get(NEED_SYNTHETIC_ACCESSOR, descriptor))) {
             // Not a super call because neither constructors nor private members can be targets of super calls
             accessibleDescriptorIfNeeded(descriptor, /* superCallExpression = */ null);
         }