Rename JS_CURRENT_ISOLATE to JS_CURRENT_ISOLATE_CONTEXT.

dart/tests/compiler/dart2js/type_guard_unuser_test.dart

 // Copyright (c) 2011, 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.
 
 import "package:expect/expect.dart";
 import 'compiler_helper.dart';
 
 const String TEST_ONE = r"""
 foo(a) {
   int b = foo(true);
@@ skipping 27 matching lines @@
   }
   return t;
 }
 """;
 
 main() {
   String generated = compile(TEST_ONE, entry: 'foo');
   RegExp regexp = new RegExp(getIntTypeCheck(anyIdentifier));
   Iterator<Match> matches = regexp.allMatches(generated).iterator;
   checkNumberOfMatches(matches, 0);
-  Expect.isTrue(generated.contains(r'return a === true ? $.foo(2) : b;'));
+  Expect.isTrue(
+      generated.contains(
+          new RegExp(r'return a === true \? [$a-z]+\.foo\(2\) : b;')));
 
   generated = compile(TEST_TWO, entry: 'foo');
   regexp = new RegExp("foo\\(1\\)");
   matches = regexp.allMatches(generated).iterator;
   checkNumberOfMatches(matches, 1);
 
   generated = compile(TEST_THREE, entry: 'foo');
   regexp = new RegExp(getNumberTypeCheck('a'));
   Expect.isTrue(regexp.hasMatch(generated));
   regexp = new RegExp(getNumberTypeCheck('b'));
   Expect.isTrue(regexp.hasMatch(generated));
 
   generated = compile(TEST_THREE_WITH_BAILOUT, entry: 'foo');
   regexp = new RegExp(getNumberTypeCheck('a'));
   Expect.isTrue(regexp.hasMatch(generated));
   regexp = new RegExp(getNumberTypeCheck('b'));
   Expect.isTrue(regexp.hasMatch(generated));
 }