Clean up backend.common.ir.IrUtils.kt

compiler/ir/ir.tree/src/org/jetbrains/kotlin/ir/declarations/lazy/IrLazyFunctionBase.kt

@@ -36,18 +36,20 @@ abstract class IrLazyFunctionBase(
 
     override var dispatchReceiverParameter: IrValueParameter? by lazyVar {
         typeTranslator.buildWithScope(this) {
-            descriptor.dispatchReceiverParameter?.generateReceiverParameterStub()
+            descriptor.dispatchReceiverParameter?.generateReceiverParameterStub()?.also { it.parent = this@IrLazyFunctionBase }
         }
     }
     override var extensionReceiverParameter: IrValueParameter? by lazyVar {
         typeTranslator.buildWithScope(this) {
-            descriptor.extensionReceiverParameter?.generateReceiverParameterStub()
+            descriptor.extensionReceiverParameter?.generateReceiverParameterStub()?.also { it.parent = this@IrLazyFunctionBase }
         }
     }
 
     override val valueParameters: MutableList<IrValueParameter> by lazy {
         typeTranslator.buildWithScope(this) {
-            descriptor.valueParameters.mapTo(arrayListOf()) { stubGenerator.generateValueParameterStub(it) }
+            descriptor.valueParameters.mapTo(arrayListOf()) {
+                stubGenerator.generateValueParameterStub(it).apply { parent = this@IrLazyFunctionBase }
+            }
         }
     }
 

compiler/ir/ir.tree/src/org/jetbrains/kotlin/ir/types/irTypes.kt

@@ -110,7 +110,13 @@ fun ClassifierDescriptor.toIrType(hasQuestionMark: Boolean = false, symbolTable:
     return IrSimpleTypeImpl(defaultType, symbol, hasQuestionMark, listOf(), listOf())
 }
 
-val IrTypeParameter.defaultType: IrType get() = symbol.owner.defaultType
+val IrTypeParameter.defaultType: IrType
+    get() = IrSimpleTypeImpl(
+        symbol,
+        hasQuestionMark = false,
+        arguments = emptyList(),
+        annotations = emptyList()
+    )
 
 fun IrClassifierSymbol.typeWith(vararg arguments: IrType): IrSimpleType = typeWith(arguments.toList())