Make top-level property backing field private in bytecode

compiler/tests/org/jetbrains/kotlin/codegen/PropertyGenTest.java

@@ -79,7 +79,7 @@ public class PropertyGenTest extends CodegenTestCase {
         Field field = fields[0];
         field.setAccessible(true);
         assertEquals("x", field.getName());
-        assertEquals(Modifier.STATIC | Modifier.FINAL, field.getModifiers());
+        assertEquals(Modifier.STATIC | Modifier.FINAL | Modifier.PRIVATE, field.getModifiers());
         assertEquals(239, field.get(null));
     }
 

compiler/tests/org/jetbrains/kotlin/codegen/generated/BlackBoxWithStdlibCodegenTestGenerated.java

@@ -4666,6 +4666,12 @@ public class BlackBoxWithStdlibCodegenTestGenerated extends AbstractBlackBoxCode
             doTestWithStdlib(fileName);
         }
 
+        @TestMetadata("privateVisibility.kt")
+        public void testPrivateVisibility() throws Exception {
+            String fileName = JetTestUtils.navigationMetadata("compiler/testData/codegen/boxWithStdlib/topLevelPrivate/privateVisibility.kt");
+            doTestWithStdlib(fileName);
+        }
+
         @TestMetadata("syntheticAccessor.kt")
         public void testSyntheticAccessor() throws Exception {
             String fileName = JetTestUtils.navigationMetadata("compiler/testData/codegen/boxWithStdlib/topLevelPrivate/syntheticAccessor.kt");