[IR] Use more specific type (IrSimpleFunction) for accessors in IrLocalDelegatedProperty

compiler/ir/ir.tree.persistent/src/org/jetbrains/kotlin/ir/declarations/persistent/PersistentIrLocalDelegatedProperty.kt

@@ -1,17 +1,6 @@
 /*
- * Copyright 2010-2016 JetBrains s.r.o.
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- * http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
+ * Copyright 2010-2020 JetBrains s.r.o. and Kotlin Programming Language contributors.
+ * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
  */
 
 package org.jetbrains.kotlin.ir.declarations.persistent
@@ -78,9 +67,9 @@ internal class PersistentIrLocalDelegatedProperty(
             }
         }
 
-    override var getterField: IrFunction? = null
+    override var getterField: IrSimpleFunction? = null
 
-    override var getter: IrFunction
+    override var getter: IrSimpleFunction
         get() = getCarrier().getterField!!
         set(v) {
             if (getCarrier().getterField !== v) {
@@ -88,9 +77,9 @@ internal class PersistentIrLocalDelegatedProperty(
             }
         }
 
-    override var setterField: IrFunction? = null
+    override var setterField: IrSimpleFunction? = null
 
-    override var setter: IrFunction?
+    override var setter: IrSimpleFunction?
         get() = getCarrier().setterField
         set(v) {
             if (setter !== v) {

compiler/ir/ir.tree.persistent/src/org/jetbrains/kotlin/ir/declarations/persistent/carriers/LocalDelegatedPropertyCarrier.kt

@@ -1,6 +1,6 @@
 /*
- * Copyright 2010-2019 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license
- * that can be found in the license/LICENSE.txt file.
+ * Copyright 2010-2020 JetBrains s.r.o. and Kotlin Programming Language contributors.
+ * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
  */
 
 package org.jetbrains.kotlin.ir.declarations.persistent.carriers
@@ -12,8 +12,8 @@ import org.jetbrains.kotlin.ir.types.IrType
 internal interface LocalDelegatedPropertyCarrier : DeclarationCarrier {
     var typeField: IrType
     var delegateField: IrVariable?
-    var getterField: IrFunction?
-    var setterField: IrFunction?
+    var getterField: IrSimpleFunction?
+    var setterField: IrSimpleFunction?
     var metadataField: MetadataSource?
 
     override fun clone(): LocalDelegatedPropertyCarrier {
@@ -38,7 +38,7 @@ internal class LocalDelegatedPropertyCarrierImpl(
     override var annotationsField: List<IrConstructorCall>,
     override var typeField: IrType,
     override var delegateField: IrVariable?,
-    override var getterField: IrFunction?,
-    override var setterField: IrFunction?,
+    override var getterField: IrSimpleFunction?,
+    override var setterField: IrSimpleFunction?,
     override var metadataField: MetadataSource?
 ) : LocalDelegatedPropertyCarrier