Add a new variable environment for testing, to replace the misusage of 'arch'.

dart/tests/stub-generator/src/MintMakerPromiseWithStubsTest-generatedTest.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.
 
 // IsolateStubs=MintMakerPromiseWithStubsTest.dart:Mint,Purse
 
 #import("../../isolate/src/TestFramework.dart");
 
-/* class = Mint (file:/usr/local/google/users/scheglov/Clients/Dart/dart/tests/stub-generator/src/MintMakerPromiseWithStubsTest.dart/MintMakerPromiseWithStubsTest.dart: 9) */
+/* class = Mint (tests/stub-generator/src/MintMakerPromiseWithStubsTest.dart/MintMakerPromiseWithStubsTest.dart: 9) */
 
 interface Mint$Proxy {
   Purse$Proxy createPurse(int balance);
 }
 
 class Mint$ProxyImpl extends ProxyImpl implements Mint$Proxy {
   Mint$ProxyImpl(Promise<SendPort> port) : super.forReply(port) { }
   Mint$ProxyImpl.forIsolate(Proxy isolate) : super.forReply(isolate.call([null])) { }
   factory Mint$ProxyImpl.createIsolate() {
     Proxy isolate = new Proxy.forIsolate(new Mint$Dispatcher$Isolate());
@@ skipping 32 matching lines @@
   void main() {
     this.port.receive(void _(var message, SendPort replyTo) {
       Mint thing = new Mint();
       SendPort port = Dispatcher.serve(new Mint$Dispatcher(thing));
       Proxy proxy = new Proxy.forPort(replyTo);
       proxy.send([port]);
     });
   }
 }
 
-/* class = Purse (file:/usr/local/google/users/scheglov/Clients/Dart/dart/tests/stub-generator/src/MintMakerPromiseWithStubsTest.dart/MintMakerPromiseWithStubsTest.dart: 17) */
+/* class = Purse (tests/stub-generator/src/MintMakerPromiseWithStubsTest.dart/MintMakerPromiseWithStubsTest.dart: 17) */
 
 interface Purse$Proxy {
   Promise<int> queryBalance();
 
   Purse$Proxy sproutPurse();
 
   Promise<int> deposit(int amount, Purse$Proxy source);
 }
 
 class Purse$ProxyImpl extends ProxyImpl implements Purse$Proxy {
@@ skipping 158 matching lines @@
         });
     });
     expect.succeeded();
   }
 
 }
 
 main() {
   runTests([MintMakerPromiseWithStubsTest.testMain]);
 }