Move dart2js from sdk/lib/_internal/compiler to pkg/compiler

sdk/lib/_internal/compiler/implementation/native/js.dart

-// Copyright (c) 2014, the Dart project authors.  Please see the AUTHORS file
-// for details. All rights reserved. Use of this source code is governed by a
-// BSD-style license that can be found in the LICENSE file.
-
-part of native;
-
-class SideEffectsVisitor extends js.BaseVisitor {
-  final SideEffects sideEffects;
-  SideEffectsVisitor(this.sideEffects);
-
-  void visit(js.Node node) {
-    node.accept(this);
-  }
-
-  void visitLiteralExpression(js.LiteralExpression node) {
-    sideEffects.setAllSideEffects();
-    sideEffects.setDependsOnSomething();
-    node.visitChildren(this);
-  }
-
-  void visitLiteralStatement(js.LiteralStatement node) {
-    sideEffects.setAllSideEffects();
-    sideEffects.setDependsOnSomething();
-    node.visitChildren(this);
-  }
-
-  void visitAssignment(js.Assignment node) {
-    sideEffects.setChangesStaticProperty();
-    sideEffects.setChangesInstanceProperty();
-    sideEffects.setChangesIndex();
-    node.visitChildren(this);
-  }
-
-  void visitVariableInitialization(js.VariableInitialization node) {
-    node.visitChildren(this);
-  }
-
-  void visitCall(js.Call node) {
-    sideEffects.setAllSideEffects();
-    sideEffects.setDependsOnSomething();
-    node.visitChildren(this);
-  }
-
-  void visitBinary(js.Binary node) {
-    node.visitChildren(this);
-  }
-
-  void visitThrow(js.Throw node) {
-    // TODO(ngeoffray): Incorporate a mayThrow flag in the
-    // [SideEffects] class.
-    sideEffects.setAllSideEffects();
-  }
-
-  void visitNew(js.New node) {
-    sideEffects.setAllSideEffects();
-    sideEffects.setDependsOnSomething();
-    node.visitChildren(this);
-  }
-
-  void visitPrefix(js.Prefix node) {
-    if (node.op == 'delete') {
-      sideEffects.setChangesStaticProperty();
-      sideEffects.setChangesInstanceProperty();
-      sideEffects.setChangesIndex();
-    }
-    node.visitChildren(this);
-  }
-
-  void visitVariableUse(js.VariableUse node) {
-    sideEffects.setDependsOnStaticPropertyStore();
-  }
-
-  void visitPostfix(js.Postfix node) {
-    node.visitChildren(this);
-  }
-
-  void visitAccess(js.PropertyAccess node) {
-    sideEffects.setDependsOnIndexStore();
-    sideEffects.setDependsOnInstancePropertyStore();
-    sideEffects.setDependsOnStaticPropertyStore();
-    node.visitChildren(this);
-  }
-}