Harmony: optimize Math.clz32.

src/ia32/lithium-ia32.cc

Index: src/ia32/lithium-ia32.cc
diff --git a/src/ia32/lithium-ia32.cc b/src/ia32/lithium-ia32.cc
index bbbc7ec731fb48239cdb6cdb863dc5a3e7e717bc..6b4db67aecd5501bd40069910fefa60cd5e2de94 100644
--- a/src/ia32/lithium-ia32.cc
+++ b/src/ia32/lithium-ia32.cc
@@ -1184,6 +1184,7 @@ LInstruction* LChunkBuilder::DoUnaryMathOperation(HUnaryMathOperation* instr) {
     case kMathExp: return DoMathExp(instr);
     case kMathSqrt: return DoMathSqrt(instr);
     case kMathPowHalf: return DoMathPowHalf(instr);
+    case kMathClz32: return DoMathClz32(instr);
     default:
       UNREACHABLE();
       return NULL;
@@ -1222,6 +1223,13 @@ LInstruction* LChunkBuilder::DoMathLog(HUnaryMathOperation* instr) {
 }
 
 
+LInstruction* LChunkBuilder::DoMathClz32(HUnaryMathOperation* instr) {
+  LOperand* input = UseRegisterAtStart(instr->value());
+  LMathClz32* result = new(zone()) LMathClz32(input);
+  return DefineAsRegister(result);
+}
+
+
 LInstruction* LChunkBuilder::DoMathExp(HUnaryMathOperation* instr) {
   ASSERT(instr->representation().IsDouble());
   ASSERT(instr->value()->representation().IsDouble());