Fix pattern detection for replacing shifts by rotation.

test/mjsunit/regress/regress-2499.js

Index: test/mjsunit/regress/regress-2499.js
diff --git a/test/mjsunit/regress/regress-110509.js b/test/mjsunit/regress/regress-2499.js
similarity index 85%
copy from test/mjsunit/regress/regress-110509.js
copy to test/mjsunit/regress/regress-2499.js
index 132bd233bee32f6c84061049224ea43901dae06a..52aad874db6fcdc89f5ee1ae4db45304e64b0e77 100644
--- a/test/mjsunit/regress/regress-110509.js
+++ b/test/mjsunit/regress/regress-2499.js
@@ -1,4 +1,4 @@
-// Copyright 2012 the V8 project authors. All rights reserved.
+// Copyright 2013 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
@@ -27,15 +27,14 @@
 
 // Flags: --allow-natives-syntax
 
-// Verify that LRandom preserves rsi correctly.
-
-function foo() {
-  Math.random();
-  new Function("");
+function foo(word, nBits) {
+  return (word[1] >>> nBits) | (word[0] << (32 - nBits));
 }
 
-foo();
-foo();
-foo();
+word = [0x1001, 0];
+
+var expected = foo(word, 1);
+foo(word, 1);
 %OptimizeFunctionOnNextCall(foo);
-foo();
+var optimized = foo(word, 1);
+assertEquals(expected, optimized)