Add rotate-right instruction to hydrogen and use it instead of bitwise operations

src/x64/lithium-codegen-x64.cc

 // Copyright 2012 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:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 1192 matching lines @@
 
 void LCodeGen::DoShiftI(LShiftI* instr) {
   LOperand* left = instr->left();
   LOperand* right = instr->right();
   ASSERT(left->Equals(instr->result()));
   ASSERT(left->IsRegister());
   if (right->IsRegister()) {
     ASSERT(ToRegister(right).is(rcx));
 
     switch (instr->op()) {
+      case Token::ROR:
+        __ rorl_cl(ToRegister(left));
+        break;
       case Token::SAR:
         __ sarl_cl(ToRegister(left));
         break;
       case Token::SHR:
         __ shrl_cl(ToRegister(left));
         if (instr->can_deopt()) {
           __ testl(ToRegister(left), ToRegister(left));
           DeoptimizeIf(negative, instr->environment());
         }
         break;
       case Token::SHL:
         __ shll_cl(ToRegister(left));
         break;
       default:
         UNREACHABLE();
         break;
     }
   } else {
     int value = ToInteger32(LConstantOperand::cast(right));
     uint8_t shift_count = static_cast<uint8_t>(value & 0x1F);
     switch (instr->op()) {
+      case Token::ROR:
+        if (shift_count != 0) {
+          __ rorl(ToRegister(left), Immediate(shift_count));
+        }
+        break;
       case Token::SAR:
         if (shift_count != 0) {
           __ sarl(ToRegister(left), Immediate(shift_count));
         }
         break;
       case Token::SHR:
         if (shift_count == 0 && instr->can_deopt()) {
           __ testl(ToRegister(left), ToRegister(left));
           DeoptimizeIf(negative, instr->environment());
         } else {
@@ skipping 4092 matching lines @@
                                FixedArray::kHeaderSize - kPointerSize));
   __ bind(&done);
 }
 
 
 #undef __
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_X64