Transform (x && y) && z into x && (y && z).

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");
 
 final String TEST_ONE = @"""
 void foo(bar) {
   var a = 1;
@@ skipping 10 matching lines @@
 void main() {
   var t = 0;
   for (var i = 0; i == 0; i = i + 1) {
     t = t + 10;
   }
   print(t);
 }
 """;
 
 final String TEST_THREE = @"""
-foo(b, c) {
+foo(b, c, d) {
   var val = 42;
   if (b) {
+    c = c && d;
     if (c) {
       val = 43;
     }
   }
   return val;
 }
 """;
 
 final String TEST_FOUR = @"""
 foo() {
@@ skipping 36 matching lines @@
   Expect.isTrue(regexp.hasMatch(generated));
 
   generated = compile(TEST_FOUR, 'foo');
 
   regexp = const RegExp("cond1 = cond1;");
   Expect.isTrue(!regexp.hasMatch(generated));
 
   regexp = const RegExp("cond2 = cond2;");
   Expect.isTrue(!regexp.hasMatch(generated));
 }