FIR: don't copy initializer for field override, unwrap it instead

compiler/fir/fir2ir/src/org/jetbrains/kotlin/fir/backend/Fir2IrDeclarationStorage.kt

@@ -1110,7 +1110,7 @@ class Fir2IrDeclarationStorage(
                 } else {
                     fieldStaticOverrideCache[field.name to classId] = this
                 }
-                val initializer = field.initializer
+                val initializer = field.unwrapFakeOverrides().initializer
                 if (initializer is FirConstExpression<*>) {
                     this.initializer = factory.createExpressionBody(initializer.toIrConst(type))
                 }

compiler/fir/fir2ir/src/org/jetbrains/kotlin/fir/backend/generators/FakeOverrideGenerator.kt

@@ -173,7 +173,7 @@ class FakeOverrideGenerator(
                             FirFakeOverrideGenerator.createSubstitutionOverrideField(
                                 session, firField, callableSymbol,
                                 newReturnType = firField.returnTypeRef.coneType,
-                                firClass.symbol.classId, withInitializer = true
+                                derivedClassId = firClass.symbol.classId
                             )
                         },
                         baseStaticFieldSymbols,

compiler/fir/providers/src/org/jetbrains/kotlin/fir/scopes/impl/FirClassSubstitutionScope.kt

@@ -311,7 +311,7 @@ class FirClassSubstitutionScope(
         val newReturnType = returnType?.substitute() ?: return original
 
         return FirFakeOverrideGenerator.createSubstitutionOverrideField(
-            session, member, original, newReturnType, newOwnerClassId, withInitializer = false
+            session, member, original, newReturnType, newOwnerClassId
         )
     }
 

compiler/fir/providers/src/org/jetbrains/kotlin/fir/scopes/impl/FirFakeOverrideGenerator.kt

@@ -487,8 +487,7 @@ object FirFakeOverrideGenerator {
         baseField: FirField,
         baseSymbol: FirFieldSymbol,
         newReturnType: ConeKotlinType?,
-        derivedClassId: ClassId?,
-        withInitializer: Boolean
+        derivedClassId: ClassId?
     ): FirFieldSymbol {
         val symbol = FirFieldSymbol(
             CallableId(derivedClassId ?: baseSymbol.callableId.classId!!, baseField.name)
@@ -508,9 +507,6 @@ object FirFakeOverrideGenerator {
             annotations += baseField.annotations
             attributes = baseField.attributes.copy()
             dispatchReceiverType = baseField.dispatchReceiverType
-            if (withInitializer) {
-                initializer = baseField.initializer
-            }
         }.apply {
             originalForSubstitutionOverrideAttr = baseField
             if (isStatic && derivedClassId != null) {