dart2js: run dartfmt on tests

tests/compiler/dart2js_extra/phi_elimination_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";
 
 void bar() {
   var a = 0;
   var c = 0;
 
-  if (a == 0) c = a++;
-  else c = a--;
+  if (a == 0)
+    c = a++;
+  else
+    c = a--;
 
   Expect.equals(1, a);
   Expect.equals(0, c);
 
-  if (a == 0) c = a++;
-  else c = a--;
+  if (a == 0)
+    c = a++;
+  else
+    c = a--;
 
   Expect.equals(0, a);
   Expect.equals(1, c);
 }
 
 void foo() {
   var a = 0;
   var c = 0;
 
   if (a == 0) {
@@ skipping 16 matching lines @@
   }
 
   Expect.equals(0, a);
   Expect.equals(1, c);
 }
 
 main() {
   foo();
   bar();
 }