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
+}

compiler/testData/diagnostics/tests/override/ObjectDelegationManyImpl.kt

@@ -10,4 +10,4 @@ object Impl : D, E {
     override fun foo() {}
 }
 
-val obj: D = <!MANY_IMPL_MEMBER_NOT_IMPLEMENTED!>object<!> : D by Impl, E by Impl {}
+val obj: D = <!MANY_IMPL_MEMBER_NOT_IMPLEMENTED!>object<!> : D by Impl, E by Impl {}

compiler/testData/diagnostics/tests/override/kt4785classObject.kt

@@ -7,7 +7,7 @@ trait B {
 }
 
 class C {
-    class <!CANNOT_INFER_VISIBILITY!>object<!> : A, B {
+    <!CANNOT_INFER_VISIBILITY!>class object<!> : A, B {
         fun bar() = null
     }
 }