Make unit testing of the compiler work with the new isolate helper library.

tests/isolate/isolate2_negative_test.dart

Index: tests/isolate/isolate2_negative_test.dart
===================================================================
--- tests/isolate/isolate2_negative_test.dart	(revision 16156)
+++ tests/isolate/isolate2_negative_test.dart	(working copy)
@@ -14,4 +14,9 @@
 
 main() {
   SendPort port = spawnFunction(entry);
+  // TODO(ngeoffray): Remove this code and update dart2js to wait for

[kasperl, 2012/12/14 10:13:42]

File bug for this.

+  // all ports to be closed.
+  // Make sure the main thread stays alive so that the spawned isolate
+  // can run.
+  port.receive((msg) {});

[ahe, 2012/12/14 10:13:52]

I would be more comfortable if this modification was made to a copy in
tests/compiler/dart2js.

 }