[FE 1.0] Prohibit access to members of companion of enum from enum entry initializer

^KT-49461 Fixed
^KT-49110

compiler/testData/diagnostics/tests/controlFlowAnalysis/UninitializedEnumCompanionVals.kt

@@ -1,7 +1,7 @@
 // SKIP_TXT
 
 enum class A(val z: Any) {
-    Y(<!UNINITIALIZED_VARIABLE!>x<!>);
+    Y(<!UNINITIALIZED_ENUM_COMPANION_WARNING, UNINITIALIZED_VARIABLE!>x<!>);
 
     companion object {
         val x = A.Y.ordinal
@@ -9,7 +9,7 @@ enum class A(val z: Any) {
 }
 
 enum class B(val z: Any) {
-    Y(B.x);
+    Y(<!UNINITIALIZED_ENUM_COMPANION_WARNING!>B<!>.x);
 
     companion object {
         val x = B.Y.ordinal