IR: add default implementations for acceptChildren/transformChildren

To simplify migration to auto-generated IR.

compiler/ir/backend.js/src/org/jetbrains/kotlin/ir/backend/js/lower/coroutines/StateMachineBuilder.kt

@@ -52,10 +52,6 @@ class IrDispatchPoint(val target: SuspendState) : IrExpression() {
         }
 
     override fun <R, D> accept(visitor: IrElementVisitor<R, D>, data: D) = visitor.visitExpression(this, data)
-
-    override fun <D> acceptChildren(visitor: IrElementVisitor<Unit, D>, data: D) {}
-
-    override fun <D> transformChildren(transformer: IrElementTransformer<D>, data: D) {}
 }
 
 class DispatchPointTransformer(val action: (SuspendState) -> IrExpression) : IrElementTransformerVoid() {

compiler/ir/ir.tree/src/org/jetbrains/kotlin/ir/IrElementBase.kt

@@ -17,8 +17,17 @@
 package org.jetbrains.kotlin.ir
 
 import org.jetbrains.kotlin.ir.visitors.IrElementTransformer
+import org.jetbrains.kotlin.ir.visitors.IrElementVisitor
 
 abstract class IrElementBase : IrElement {
     override fun <D> transform(transformer: IrElementTransformer<D>, data: D): IrElement =
         accept(transformer, data)
+
+    override fun <D> acceptChildren(visitor: IrElementVisitor<Unit, D>, data: D) {
+        // No children by default
+    }
+
+    override fun <D> transformChildren(transformer: IrElementTransformer<D>, data: D) {
+        // No children by default
+    }
 }

compiler/ir/ir.tree/src/org/jetbrains/kotlin/ir/declarations/IrErrorDeclaration.kt

@@ -6,21 +6,12 @@
 package org.jetbrains.kotlin.ir.declarations
 
 import org.jetbrains.kotlin.ir.symbols.IrSymbol
-import org.jetbrains.kotlin.ir.visitors.IrElementTransformer
 import org.jetbrains.kotlin.ir.visitors.IrElementVisitor
 
 abstract class IrErrorDeclaration : IrDeclarationBase() {
     override fun <R, D> accept(visitor: IrElementVisitor<R, D>, data: D): R =
         visitor.visitErrorDeclaration(this, data)
 
-    override fun <D> acceptChildren(visitor: IrElementVisitor<Unit, D>, data: D) {
-        // no children
-    }
-
-    override fun <D> transformChildren(transformer: IrElementTransformer<D>, data: D) {
-        // no children
-    }
-
     override val symbol: IrSymbol
         get() = error("Should never be called")
 }

compiler/ir/ir.tree/src/org/jetbrains/kotlin/ir/declarations/IrTypeParameter.kt

@@ -28,12 +28,4 @@ abstract class IrTypeParameter : IrDeclarationBase(), IrDeclarationWithName {
 
     override fun <D> transform(transformer: IrElementTransformer<D>, data: D): IrTypeParameter =
         transformer.visitTypeParameter(this, data) as IrTypeParameter
-
-    override fun <D> acceptChildren(visitor: IrElementVisitor<Unit, D>, data: D) {
-        // no children
-    }
-
-    override fun <D> transformChildren(transformer: IrElementTransformer<D>, data: D) {
-        // no children
-    }
 }

compiler/ir/ir.tree/src/org/jetbrains/kotlin/ir/expressions/IrExpression.kt

@@ -10,7 +10,6 @@ import org.jetbrains.kotlin.ir.IrStatement
 import org.jetbrains.kotlin.ir.declarations.IrAttributeContainer
 import org.jetbrains.kotlin.ir.types.IrType
 import org.jetbrains.kotlin.ir.visitors.IrElementTransformer
-import org.jetbrains.kotlin.ir.visitors.IrElementVisitor
 
 abstract class IrExpression : IrElementBase(), IrStatement, IrVarargElement, IrAttributeContainer {
     @Suppress("LeakingThis")
@@ -20,12 +19,4 @@ abstract class IrExpression : IrElementBase(), IrStatement, IrVarargElement, IrA
 
     override fun <D> transform(transformer: IrElementTransformer<D>, data: D): IrExpression =
         accept(transformer, data) as IrExpression
-
-    override fun <D> acceptChildren(visitor: IrElementVisitor<Unit, D>, data: D) {
-        // No children by default
-    }
-
-    override fun <D> transformChildren(transformer: IrElementTransformer<D>, data: D) {
-        // No children by default
-    }
 }

compiler/ir/ir.tree/src/org/jetbrains/kotlin/ir/expressions/IrSyntheticBody.kt

@@ -5,7 +5,6 @@
 
 package org.jetbrains.kotlin.ir.expressions
 
-import org.jetbrains.kotlin.ir.visitors.IrElementTransformer
 import org.jetbrains.kotlin.ir.visitors.IrElementVisitor
 
 abstract class IrSyntheticBody : IrBody() {
@@ -13,12 +12,4 @@ abstract class IrSyntheticBody : IrBody() {
 
     override fun <R, D> accept(visitor: IrElementVisitor<R, D>, data: D): R =
         visitor.visitSyntheticBody(this, data)
-
-    override fun <D> acceptChildren(visitor: IrElementVisitor<Unit, D>, data: D) {
-        // no children
-    }
-
-    override fun <D> transformChildren(transformer: IrElementTransformer<D>, data: D) {
-        // no children
-    }
 }