Updated tests/compiler/* to use new library syntax.

tests/compiler/dart2js/ssa_phi_codegen_test.dart

 // Copyright (c) 2012, 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.
 // Test that parameters keep their names in the output.
 
-#import("compiler_helper.dart");
+import 'compiler_helper.dart';
 
 const String TEST_ONE = r"""
 void foo(bar) {
   var a = 1;
   if (bar) {
     a = 2;
   } else {
     a = 3;
   }
   print(a);
@@ skipping 48 matching lines @@
   // Check that we don't have 'd = d' (using regexp back references).
   compileAndDoNotMatchFuzzy(TEST_THREE, 'foo', '(x) = \1');
   compileAndMatchFuzzy(TEST_THREE, 'foo', 'return x');
   // Check that a store just after the declaration of the local
   // only generates one instruction.
   compileAndMatchFuzzy(TEST_THREE, 'foo', 'x = 42');
 
   var generated = compile(TEST_FOUR, entry: 'foo');
   compileAndDoNotMatchFuzzy(TEST_FOUR, 'foo', '(x) = \1;');
 }