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

^KT-49110

analysis/analysis-api-fir/src/org/jetbrains/kotlin/analysis/api/fir/diagnostics/KtFirDiagnostics.kt

@@ -2028,7 +2028,7 @@ sealed class KtFirDiagnostic<PSI : PsiElement> : KtDiagnosticWithPsi<PSI> {
         abstract val enumEntry: KtSymbol
     }
 
-    abstract class UninitializedEnumCompanion : KtFirDiagnostic<KtSimpleNameExpression>() {
+    abstract class UninitializedEnumCompanion : KtFirDiagnostic<KtExpression>() {
         override val diagnosticClass get() = UninitializedEnumCompanion::class
         abstract val enumClass: KtClassLikeSymbol
     }

analysis/analysis-api-fir/src/org/jetbrains/kotlin/analysis/api/fir/diagnostics/KtFirDiagnosticsImpl.kt

@@ -2446,7 +2446,7 @@ internal class UninitializedEnumCompanionImpl(
     override val enumClass: KtClassLikeSymbol,
     override val firDiagnostic: KtPsiDiagnostic,
     override val token: ValidityToken,
-) : KtFirDiagnostic.UninitializedEnumCompanion(), KtAbstractFirDiagnostic<KtSimpleNameExpression>
+) : KtFirDiagnostic.UninitializedEnumCompanion(), KtAbstractFirDiagnostic<KtExpression>
 
 internal class ValReassignmentImpl(
     override val variable: KtVariableLikeSymbol,

analysis/low-level-api-fir/tests/org/jetbrains/kotlin/analysis/low/level/api/fir/diagnostic/compiler/based/DiagnosisCompilerTestFE10TestdataTestGenerated.java

@@ -5751,6 +5751,18 @@ public class DiagnosisCompilerTestFE10TestdataTestGenerated extends AbstractDiag
                 runTest("compiler/testData/diagnostics/tests/controlFlowAnalysis/tryWithAssignmentUsedInCatch.kt");
             }
 
+            @Test
+            @TestMetadata("uninitializedCompanionOfEnum_after.kt")
+            public void testUninitializedCompanionOfEnum_after() throws Exception {
+                runTest("compiler/testData/diagnostics/tests/controlFlowAnalysis/uninitializedCompanionOfEnum_after.kt");
+            }
+
+            @Test
+            @TestMetadata("uninitializedCompanionOfEnum_before.kt")
+            public void testUninitializedCompanionOfEnum_before() throws Exception {
+                runTest("compiler/testData/diagnostics/tests/controlFlowAnalysis/uninitializedCompanionOfEnum_before.kt");
+            }
+
             @Test
             @TestMetadata("UninitializedEnumCompanionVals.kt")
             public void testUninitializedEnumCompanionVals() throws Exception {