[turbofan] Introduce WordRor machine operator.

test/base-unittests/bits-unittest.cc

+// 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.
+
+#include "src/base/bits.h"
+#include "src/base/macros.h"
+#include "testing/gtest-support.h"
+
+namespace v8 {
+namespace base {
+namespace bits {
+
+TEST(BitsTest, RotateRight32) {
+  TRACED_FORRANGE(uint32_t, shift, 0, 31) {
+    EXPECT_EQ(0u, RotateRight32(0u, shift));
+  }
+  EXPECT_EQ(1u, RotateRight32(1, 0));
+  EXPECT_EQ(1u, RotateRight32(2, 1));
+  EXPECT_EQ(0x80000000u, RotateRight32(1, 1));
+}
+
+
+TEST(BitsTest, RotateRight64) {
+  TRACED_FORRANGE(uint64_t, shift, 0, 63) {
+    EXPECT_EQ(0u, RotateRight64(0u, shift));
+  }
+  EXPECT_EQ(1u, RotateRight64(1, 0));
+  EXPECT_EQ(1u, RotateRight64(2, 1));
+  EXPECT_EQ(V8_UINT64_C(0x8000000000000000), RotateRight64(1, 1));
+}
+
+}  // namespace bits
+}  // namespace base
+}  // namespace v8