Drop enum class object hack

Place valueOf() and values() into the static scope of the corresponding enum
class

 #KT-5580 Fixed
 #KT-2410 Fixed

compiler/testData/diagnostics/tests/redeclarations/EnumEntriesAndClassObjectMembers.kt

@@ -0,0 +1,11 @@
+enum class E {
+    <!REDECLARATION!>FIRST<!>
+
+    <!REDECLARATION!>SECOND<!>
+
+    class object {
+        class <!REDECLARATION!>FIRST<!>
+
+        val <!REDECLARATION!>SECOND<!> = this
+    }
+}