Fix initializer lowering crash during deep copy

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

@@ -93,7 +93,7 @@ class InitializersLowering(
             irClass.transformChildrenVoid(object : IrElementTransformerVoid() {
                 override fun visitInstanceInitializerCall(expression: IrInstanceInitializerCall): IrExpression {
                     return IrBlockImpl(irClass.startOffset, irClass.endOffset, context.builtIns.unitType, null,
-                                       instanceInitializerStatements.map { it.copy() })
+                                       instanceInitializerStatements.map { it.copy(irClass) })
                 }
             })
         }
@@ -114,7 +114,7 @@ class InitializersLowering(
                     irClass.startOffset, irClass.endOffset, declarationOrigin,
                     staticInitializerDescriptor,
                     IrBlockBodyImpl(irClass.startOffset, irClass.endOffset,
-                                    staticInitializerStatements.map { it.copy() })
+                                    staticInitializerStatements.map { it.copy(irClass) })
                 )
             )
         }
@@ -123,7 +123,7 @@ class InitializersLowering(
     companion object {
         val clinitName = Name.special("<clinit>")
 
-        fun IrStatement.copy() = deepCopyWithSymbols()
+        fun IrStatement.copy(containingDeclaration: IrClass) = deepCopyWithSymbols(containingDeclaration)
-        fun IrExpression.copy() = deepCopyWithSymbols()
+        fun IrExpression.copy(containingDeclaration: IrClass) = deepCopyWithSymbols(containingDeclaration)
     }
 }

compiler/ir/ir.tree/src/org/jetbrains/kotlin/ir/util/DeepCopyIrTreeWithSymbols.kt

@@ -31,10 +31,10 @@ import org.jetbrains.kotlin.ir.visitors.IrElementTransformerVoid
 import org.jetbrains.kotlin.ir.visitors.acceptVoid
 import java.util.*
 
-inline fun <reified T : IrElement> T.deepCopyWithSymbols(): T {
+inline fun <reified T : IrElement> T.deepCopyWithSymbols(initialParent: IrDeclarationParent? = null): T {
     val remapper = DeepCopySymbolsRemapper()
     acceptVoid(remapper)
-    return transform(DeepCopyIrTreeWithSymbols(remapper), null).patchDeclarationParents() as T
+    return transform(DeepCopyIrTreeWithSymbols(remapper), null).patchDeclarationParents(initialParent) as T
 }
 
 

compiler/ir/ir.tree/src/org/jetbrains/kotlin/ir/util/PatchDeclarationParents.kt

@@ -9,18 +9,22 @@ import org.jetbrains.kotlin.ir.IrElement
 import org.jetbrains.kotlin.ir.declarations.IrDeclaration
 import org.jetbrains.kotlin.ir.declarations.IrDeclarationParent
 import org.jetbrains.kotlin.ir.declarations.IrPackageFragment
-import org.jetbrains.kotlin.ir.declarations.impl.IrDeclarationBase
 import org.jetbrains.kotlin.ir.visitors.IrElementVisitorVoid
 import org.jetbrains.kotlin.ir.visitors.acceptChildrenVoid
 import org.jetbrains.kotlin.ir.visitors.acceptVoid
 import java.util.*
 
-fun <T : IrElement> T.patchDeclarationParents() =
+fun <T : IrElement> T.patchDeclarationParents(initialParent: IrDeclarationParent? = null) =
     apply {
-        acceptVoid(PatchDeclarationParentsVisitor())
+        val visitor = initialParent?.let { PatchDeclarationParentsVisitor(it) } ?: PatchDeclarationParentsVisitor()
+        acceptVoid(visitor)
     }
 
-class PatchDeclarationParentsVisitor : IrElementVisitorVoid {
+class PatchDeclarationParentsVisitor() : IrElementVisitorVoid {
+
+    constructor(containingDeclaration: IrDeclarationParent) : this() {
+        declarationParentsStack.push(containingDeclaration)
+    }
 
     private val declarationParentsStack = ArrayDeque<IrDeclarationParent>()