Fix IR declaration parents.

- Reparent declarations in FileClassLowering, InterfaceLowering,
  StaticDefaultFunctionsLowering, EnumClassLowering, and
  RenameFieldsLowering
- Set correspondingPropertySymbol in MoveCompanionObjectFieldsLowering
- Reparent field initializers in MoveCompanionObjectFieldsLowering and
  EnumClassLowering
- Ensure that parents are unique in PropertiesLowering
- Set declaration parent in SharedVariableManager
- Set field declaration parents in CallableReferenceLowering
- Set declaration parents in FunctionNVarargInvokeLowering
- Set declaration parents for external declaration fields

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

@@ -8,6 +8,7 @@ package org.jetbrains.kotlin.backend.common.lower
 import org.jetbrains.kotlin.backend.common.BackendContext
 import org.jetbrains.kotlin.backend.common.FileLoweringPass
 import org.jetbrains.kotlin.backend.common.descriptors.WrappedSimpleFunctionDescriptor
+import org.jetbrains.kotlin.backend.common.ir.copyTo
 import org.jetbrains.kotlin.descriptors.ClassKind
 import org.jetbrains.kotlin.descriptors.Modality
 import org.jetbrains.kotlin.descriptors.Visibilities
@@ -80,7 +81,7 @@ class PropertiesLowering(
         ).apply {
             descriptor.bind(this)
 
-            extensionReceiverParameter = declaration.getter?.extensionReceiverParameter
+            extensionReceiverParameter = declaration.getter?.extensionReceiverParameter?.copyTo(this)
 
             body = IrBlockBodyImpl(-1, -1)
 

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

@@ -106,7 +106,7 @@ class SharedVariablesLowering(val context: BackendContext) : FunctionLoweringPas
                     if (declaration !in sharedVariables) return declaration
 
                     val newDeclaration = context.sharedVariablesManager.declareSharedVariable(declaration)
-                    newDeclaration.parent = irFunction
+                    newDeclaration.parent = declaration.parent
                     transformedSymbols[declaration.symbol] = newDeclaration.symbol
 
                     return context.sharedVariablesManager.defineSharedValue(declaration, newDeclaration)