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

src/arm/simulator-arm.cc

Index: src/arm/simulator-arm.cc
diff --git a/src/arm/simulator-arm.cc b/src/arm/simulator-arm.cc
index a057de58ccf843da9f38ae581673063b71ed3af4..2089f8af220410597414f55ddfdbcfe4f1e522b8 100644
--- a/src/arm/simulator-arm.cc
+++ b/src/arm/simulator-arm.cc
@@ -1498,7 +1498,14 @@ int32_t Simulator::GetShiftRm(Instruction* instr, bool* carry_out) {
       }
 
       case ROR: {
-        UNIMPLEMENTED();
+        if (shift_amount == 0) {
+          *carry_out = c_flag_;
+        } else {

[Jay Conrod, 2012/10/01 19:41:17]

Erik Corry expressed some suspicion in my first rev about the shifts, and I
agree. "result" is signed (int32_t), so >> will sign extend. Also *carry_out
should contain the last bit that was shifted, so it can be
(static_cast<uint32_t>(result) >> 31) != 0, right?

[ulan, 2012/10/02 12:20:26]

Yes, you're right. I am taking the updated implementation that you uploaded in
the other CL.

+          int32_t left = result >> shift_amount;
+          int32_t right = result << (32 - shift_amount);
+          result = right | left;
+          *carry_out = (result >> (shift_amount - 1)) & 1;
+        }
         break;
       }