FIR: add temporary access to Enum.getDeclaringClass (see KT-49653)

compiler/testData/ir/irText/declarations/annotations/classesWithAnnotations.fir.ir.txt

@@ -181,6 +181,10 @@ FILE fqName:<root> fileName:/classesWithAnnotations.kt
         overridden:
           public final fun <get-ordinal> (): kotlin.Int declared in kotlin.Enum
         $this: VALUE_PARAMETER name:<this> type:kotlin.Enum<E of kotlin.Enum>
+    FUN FAKE_OVERRIDE name:getDeclaringClass visibility:public modality:FINAL <> ($this:kotlin.Enum<E of kotlin.Enum>) returnType:@[FlexibleNullability] java.lang.Class<@[FlexibleNullability] <root>.TestEnum?>? [fake_override]
+      overridden:
+        public final fun getDeclaringClass (): @[FlexibleNullability] java.lang.Class<@[FlexibleNullability] E of kotlin.Enum?>? declared in kotlin.Enum
+      $this: VALUE_PARAMETER name:<this> type:kotlin.Enum<E of kotlin.Enum>
   CLASS ANNOTATION_CLASS name:TestAnnotation modality:OPEN visibility:public superTypes:[kotlin.Annotation]
     annotations:
       TestAnn(x = 'annotation')

compiler/testData/ir/irText/declarations/annotations/enumEntriesWithAnnotations.fir.ir.txt

@@ -102,6 +102,10 @@ FILE fqName:<root> fileName:/enumEntriesWithAnnotations.kt
             overridden:
               public final fun <get-ordinal> (): kotlin.Int [fake_override] declared in <root>.TestEnum
             $this: VALUE_PARAMETER name:<this> type:kotlin.Enum<E of kotlin.Enum>
+        FUN FAKE_OVERRIDE name:getDeclaringClass visibility:public modality:FINAL <> ($this:kotlin.Enum<E of kotlin.Enum>) returnType:@[FlexibleNullability] java.lang.Class<@[FlexibleNullability] <root>.TestEnum?>? [fake_override]
+          overridden:
+            public final fun getDeclaringClass (): @[FlexibleNullability] java.lang.Class<@[FlexibleNullability] <root>.TestEnum?>? [fake_override] declared in <root>.TestEnum
+          $this: VALUE_PARAMETER name:<this> type:kotlin.Enum<E of kotlin.Enum>
     FUN ENUM_CLASS_SPECIAL_MEMBER name:values visibility:public modality:FINAL <> () returnType:kotlin.Array<<root>.TestEnum>
       SYNTHETIC_BODY kind=ENUM_VALUES
     FUN ENUM_CLASS_SPECIAL_MEMBER name:valueOf visibility:public modality:FINAL <> (value:kotlin.String) returnType:<root>.TestEnum
@@ -145,3 +149,7 @@ FILE fqName:<root> fileName:/enumEntriesWithAnnotations.kt
         overridden:
           public final fun <get-ordinal> (): kotlin.Int declared in kotlin.Enum
         $this: VALUE_PARAMETER name:<this> type:kotlin.Enum<E of kotlin.Enum>
+    FUN FAKE_OVERRIDE name:getDeclaringClass visibility:public modality:FINAL <> ($this:kotlin.Enum<E of kotlin.Enum>) returnType:@[FlexibleNullability] java.lang.Class<@[FlexibleNullability] <root>.TestEnum?>? [fake_override]
+      overridden:
+        public final fun getDeclaringClass (): @[FlexibleNullability] java.lang.Class<@[FlexibleNullability] E of kotlin.Enum?>? declared in kotlin.Enum
+      $this: VALUE_PARAMETER name:<this> type:kotlin.Enum<E of kotlin.Enum>

compiler/testData/ir/irText/declarations/annotations/enumsInAnnotationArguments.fir.ir.txt

@@ -61,6 +61,10 @@ FILE fqName:<root> fileName:/enumsInAnnotationArguments.kt
         overridden:
           public final fun <get-ordinal> (): kotlin.Int declared in kotlin.Enum
         $this: VALUE_PARAMETER name:<this> type:kotlin.Enum<E of kotlin.Enum>
+    FUN FAKE_OVERRIDE name:getDeclaringClass visibility:public modality:FINAL <> ($this:kotlin.Enum<E of kotlin.Enum>) returnType:@[FlexibleNullability] java.lang.Class<@[FlexibleNullability] <root>.En?>? [fake_override]
+      overridden:
+        public final fun getDeclaringClass (): @[FlexibleNullability] java.lang.Class<@[FlexibleNullability] E of kotlin.Enum?>? declared in kotlin.Enum
+      $this: VALUE_PARAMETER name:<this> type:kotlin.Enum<E of kotlin.Enum>
   CLASS ANNOTATION_CLASS name:TestAnn modality:OPEN visibility:public superTypes:[kotlin.Annotation]
     $this: VALUE_PARAMETER INSTANCE_RECEIVER name:<this> type:<root>.TestAnn
     CONSTRUCTOR visibility:public <> (x:<root>.En) returnType:<root>.TestAnn [primary]

compiler/testData/ir/irText/declarations/annotations/javaAnnotationWithSingleArrayArgument.fir.ir.txt

@@ -83,6 +83,10 @@ FILE fqName:<root> fileName:/C.kt
         overridden:
           public final fun <get-ordinal> (): kotlin.Int declared in kotlin.Enum
         $this: VALUE_PARAMETER name:<this> type:kotlin.Enum<E of kotlin.Enum>
+    FUN FAKE_OVERRIDE name:getDeclaringClass visibility:public modality:FINAL <> ($this:kotlin.Enum<E of kotlin.Enum>) returnType:@[FlexibleNullability] java.lang.Class<@[FlexibleNullability] <root>.E?>? [fake_override]
+      overridden:
+        public final fun getDeclaringClass (): @[FlexibleNullability] java.lang.Class<@[FlexibleNullability] E of kotlin.Enum?>? declared in kotlin.Enum
+      $this: VALUE_PARAMETER name:<this> type:kotlin.Enum<E of kotlin.Enum>
   CLASS ANNOTATION_CLASS name:Annos modality:OPEN visibility:public superTypes:[kotlin.Annotation]
     $this: VALUE_PARAMETER INSTANCE_RECEIVER name:<this> type:<root>.Annos
     CONSTRUCTOR visibility:public <> (value:kotlin.Array<<root>.Anno>) returnType:<root>.Annos [primary]