Support reporting errors on class objects and any classes or objects contained anywhere

idea/testData/checker/duplicateJvmSignature/fields/classObjectCopiedFieldObject.kt

@@ -0,0 +1,7 @@
+class C {
+    <error>class object</error> {
+        <error>val `object$`</error> = this
+    }
+
+    val `object$` = C
+}