[turbofan] Introduce WordRor machine operator.

src/base/bits.h

+// 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.
+
+#ifndef V8_BASE_BITS_H_
+#define V8_BASE_BITS_H_
+
+#include "include/v8stdint.h"
+
+namespace v8 {
+namespace base {
+namespace bits {
+
+inline uint32_t RotateRight32(uint32_t value, uint32_t shift) {
+  if (shift == 0) return value;
+  return (value >> shift) | (value << (32 - shift));
+}
+
+
+inline uint64_t RotateRight64(uint64_t value, uint64_t shift) {
+  if (shift == 0) return value;
+  return (value >> shift) | (value << (64 - shift));
+}
+
+}  // namespace bits
+}  // namespace base
+}  // namespace v8
+
+#endif  // V8_BASE_BITS_H_