Format all tests.

tests/language/phi_merge_test.dart

 // Copyright (c) 2013, 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.
 
 // Regression test for dart2js that used to crash on this code.
 
 class A {
-  operator[]=(index, value) {
+  operator []=(index, value) {
     switch (value) {
-      case 42: break;
-      case 43: break;
+      case 42:
+        break;
+      case 43:
+        break;
     }
   }
 }
 
 main() {
   // Make [a] a phi.
   var a;
   if (true) {
     a = new A();
   } else {
     a = new A();
   }
   // `A[]=` being inlined, the compiler was confused when merging the
   // phis after the switch.
   a[0] = 42;
 
   // Use [a] to provoke the crash.
   print(a);
 }