dart2js: Bugfix for when 'await' occurs in an initializer list.

tests/compiler/dart2js/async_await_js_transform_test.dart

Index: tests/compiler/dart2js/async_await_js_transform_test.dart
diff --git a/tests/compiler/dart2js/async_await_js_transform_test.dart b/tests/compiler/dart2js/async_await_js_transform_test.dart
index d0f4c85636b09cafaa87d4cdfca06a1478211f0f..40c9eb654db7a656af1ee8a1e584dbd091d4040d 100644
--- a/tests/compiler/dart2js/async_await_js_transform_test.dart
+++ b/tests/compiler/dart2js/async_await_js_transform_test.dart
@@ -64,12 +64,13 @@ r"""function() async {
       switch (__goto) {
         case 0:
           // Function start
+          closures = [new A.main_closure()];
           __goto = 2;
-        closures = [new A.main_closure()];
-        return thenHelper(closures, body, __completer);
+          return thenHelper(closures, body, __completer);
         case 2:
           // returning from await.
-          v0 = __result, v1 = 0;
+          v0 = __result;
+          v1 = 0;
           if (v1 < 0 || v1 >= v0.length)
             H.ioore(v0, v1);
           else