Split HForeign into HForeignCode and abstract base class.

pkg/compiler/lib/src/ssa/codegen.dart

 // Copyright (c) 2012, 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 ssa;
 
 class SsaCodeGeneratorTask extends CompilerTask {
 
   final JavaScriptBackend backend;
 
@@ skipping 1725 matching lines @@
   void registerForeignTypes(HForeign node) {
     native.NativeBehavior nativeBehavior = node.nativeBehavior;
     if (nativeBehavior == null) return;
     nativeBehavior.typesReturned.forEach((type) {
       if (type is InterfaceType) {
         registry.registerInstantiatedType(type);
       }
     });
   }
 
-  visitForeign(HForeign node) {
+  visitForeignCode(HForeignCode node) {
     List<HInstruction> inputs = node.inputs;
     if (node.isJsStatement()) {
       List<js.Expression> interpolatedExpressions = <js.Expression>[];
       for (int i = 0; i < inputs.length; i++) {
         use(inputs[i]);
         interpolatedExpressions.add(pop());
       }
       pushStatement(node.codeTemplate.instantiate(interpolatedExpressions));
     } else {
       List<js.Expression> interpolatedExpressions = <js.Expression>[];
@@ skipping 910 matching lines @@
   js.PropertyAccess accessHelper(String name) {
     Element helper = backend.findHelper(name);
     if (helper == null) {
       // For mocked-up tests.
       return js.js('(void 0).$name');
     }
     registry.registerStaticUse(helper);
     return backend.emitter.staticFunctionAccess(helper);
   }
 }