IR BE common: IrField.isFakeOverride

compiler/ir/backend.common/src/org/jetbrains/kotlin/backend/common/lower/AbstractSuspendFunctionsLowering.kt

@@ -680,9 +680,10 @@ abstract class AbstractSuspendFunctionsLowering<C : CommonBackendContext>(val co
             name,
             type,
             Visibilities.PRIVATE,
-            !isMutable,
+            isFinal = !isMutable,
             isExternal = false,
-            isStatic = false
+            isStatic = false,
+            isFakeOverride = false
         ).also {
             descriptor.bind(it)
             it.parent = this

compiler/ir/backend.common/src/org/jetbrains/kotlin/backend/common/lower/LocalDeclarationsLowering.kt

@@ -662,7 +662,8 @@ class LocalDeclarationsLowering(
                 visibility,
                 isFinal = true,
                 isExternal = false,
-                isStatic = false
+                isStatic = false,
+                isFakeOverride = false
             ).also {
                 descriptor.bind(it)
                 it.parent = parent

compiler/ir/backend.common/src/org/jetbrains/kotlin/ir/builders/declarations/declarationBuilders.kt

@@ -43,7 +43,8 @@ fun IrFieldBuilder.buildField(): IrField {
     return IrFieldImpl(
         startOffset, endOffset, origin,
         IrFieldSymbolImpl(wrappedDescriptor),
-        name, type, visibility, isFinal, isExternal, isStatic
+        name, type, visibility, isFinal, isExternal, isStatic,
+        origin == IrDeclarationOrigin.FAKE_OVERRIDE
     ).also {
         wrappedDescriptor.bind(it)
     }