dart2js: make "CREATE_JS_ISOLATE" an embedded global.

pkg/compiler/lib/src/js_emitter/old_emitter/emitter.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 dart2js.js_emitter;
 
 
 class OldEmitter implements Emitter {
   final Compiler compiler;
   final CodeEmitterTask task;
@@ skipping 348 matching lines @@
         generateAccessorFunction,
         new jsAst.FunctionDeclaration(
             new jsAst.VariableDeclaration('defineClass'), defineClass) ];
 
     if (compiler.hasIncrementalSupport) {
       result.add(
           js(r'#.defineClass = defineClass', [namer.accessIncrementalHelper]));
     }
 
     if (hasIsolateSupport) {
+      jsAst.Expression createNewIsolateFunctionAccess =
+          generateEmbeddedGlobalAccess(embeddedNames.CREATE_NEW_ISOLATE);
+      var createIsolateAssignment =
+          js('# = function() { return new ${namer.isolateName}(); }',
+             createNewIsolateFunctionAccess);
+
       jsAst.Expression classIdExtractorAccess =
           generateEmbeddedGlobalAccess(embeddedNames.CLASS_ID_EXTRACTOR);
       var classIdExtractorAssignment =
           js('# = function(o) { return o.constructor.name; }',
               classIdExtractorAccess);
 
       jsAst.Expression classFieldsExtractorAccess =
           generateEmbeddedGlobalAccess(embeddedNames.CLASS_FIELDS_EXTRACTOR);
       var classFieldsExtractorAssignment = js('''
       # = function(o) {
@@ skipping 16 matching lines @@
              [instanceFromClassIdAccess, allClassesAccess]);
 
       jsAst.Expression initializeEmptyInstanceAccess =
           generateEmbeddedGlobalAccess(embeddedNames.INITIALIZE_EMPTY_INSTANCE);
       var initializeEmptyInstanceAssignment = js('''
       # = function(name, o, fields) {
         #[name].apply(o, fields);
         return o;
       }''', [ initializeEmptyInstanceAccess, allClassesAccess ]);
 
-      result.addAll([classIdExtractorAssignment,
+      result.addAll([createIsolateAssignment,
+                     classIdExtractorAssignment,
                      classFieldsExtractorAssignment,
                      instanceFromClassIdAssignment,
                      initializeEmptyInstanceAssignment]);
     }
 
     return result;
   }
 
   /** Needs defineClass to be defined. */
   jsAst.Expression buildInheritFrom() {
@@ skipping 1637 matching lines @@
     for (Element element in compiler.enqueuer.codegen.newlyEnqueuedElements) {
       if (element.isInstanceMember) {
         cachedClassBuilders.remove(element.enclosingClass);
 
         nativeEmitter.cachedBuilders.remove(element.enclosingClass);
 
       }
     }
   }
 }