X87: Optimize the typeof operator.

src/x87/lithium-x87.cc

Index: src/x87/lithium-x87.cc
diff --git a/src/x87/lithium-x87.cc b/src/x87/lithium-x87.cc
index 83aa33cec55d95cd9cf2342e4368e580386071fb..1b4aa1a7bb1ca71190a30442ee84cd9af383ee8f 100644
--- a/src/x87/lithium-x87.cc
+++ b/src/x87/lithium-x87.cc
@@ -2615,7 +2615,7 @@ LInstruction* LChunkBuilder::DoToFastProperties(HToFastProperties* instr) {
 
 LInstruction* LChunkBuilder::DoTypeof(HTypeof* instr) {
   LOperand* context = UseFixed(instr->context(), esi);
-  LOperand* value = UseAtStart(instr->value());
+  LOperand* value = UseFixed(instr->value(), ebx);
   LTypeof* result = new(zone()) LTypeof(context, value);
   return MarkAsCall(DefineFixed(result, eax), instr);
 }