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

src/x64/lithium-x64.cc

Index: src/x64/lithium-x64.cc
diff --git a/src/x64/lithium-x64.cc b/src/x64/lithium-x64.cc
index dd3054f2da620dd245db260826510a6d9b69d940..5000fe085ca2ed2e17d5792601d611ce0e49f592 100644
--- a/src/x64/lithium-x64.cc
+++ b/src/x64/lithium-x64.cc
@@ -179,6 +179,7 @@ const char* LArithmeticT::Mnemonic() const {
     case Token::BIT_AND: return "bit-and-t";
     case Token::BIT_OR: return "bit-or-t";
     case Token::BIT_XOR: return "bit-xor-t";
+    case Token::ROR: return "ror-t";
     case Token::SHL: return "sal-t";
     case Token::SAR: return "sar-t";
     case Token::SHR: return "shr-t";
@@ -1109,6 +1110,11 @@ LInstruction* LChunkBuilder::DoCallRuntime(HCallRuntime* instr) {
 }
 
 
+LInstruction* LChunkBuilder::DoRor(HRor* instr) {
+  return DoShift(Token::ROR, instr);
+}
+
+
 LInstruction* LChunkBuilder::DoShr(HShr* instr) {
   return DoShift(Token::SHR, instr);
 }