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

compiler/testData/diagnostics/tests/duplicateJvmSignature/specialNames/classObject.kt

@@ -1,5 +1,5 @@
 class C {
-    class object {}
+    <!CONFLICTING_JVM_DECLARATIONS!>class object<!> {}
 
     <!CONFLICTING_JVM_DECLARATIONS!>val `object$`<!> = C
 }

compiler/testData/diagnostics/tests/duplicateJvmSignature/specialNames/classObjectCopiedFieldObject.kt

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