[turbofan] remove redundant '& 0x1F' for shifts.

test/mjsunit/asm/word32ror.js

+// Copyright 2014 the V8 project authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+var stdlib = {};
+var foreign = {};
+var heap = new ArrayBuffer(64 * 1024);
+
+var rol = (function Module(stdlib, foreign, heap) {
+  "use asm";
+  function rol(x, y) {
+    x = x | 0;
+    y = y | 0;
+    return (x << y) | (x >>> (32 - y));
+  }
+  return { rol: rol };
+})(stdlib, foreign, heap).rol;
+
+assertEquals(10, rol(10, 0));
+assertEquals(2, rol(1, 1));
+assertEquals(0x40000000, rol(1, 30));
+assertEquals(-0x80000000, rol(1, 31));