Fix DoDeferredNumberTagU to keep the value in xmm1 instead of xmm0 on x64.

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 87fa90758380c29808deb2ccb686580c3828d875..6133bdeed976aa2205c6e98b5a7973d5f5af46ee 100644
--- a/src/x64/lithium-x64.cc
+++ b/src/x64/lithium-x64.cc
@@ -721,11 +721,10 @@ LInstruction* LChunkBuilder::DoShift(Token::Value op,
   // Shift operations can only deoptimize if we do a logical shift by 0 and
   // the result cannot be truncated to int32.
   bool does_deopt = false;
-  if (FLAG_opt_safe_uint32_operations) {
-    does_deopt = !instr->CheckFlag(HInstruction::kUint32);
-  } else {
-    bool may_deopt = (op == Token::SHR && constant_value == 0);
-    if (may_deopt) {
+  if (op == Token::SHR && constant_value == 0) {
+    if (FLAG_opt_safe_uint32_operations) {
+      does_deopt = !instr->CheckFlag(HInstruction::kUint32);
+    } else {
       for (HUseIterator it(instr->uses()); !it.Done(); it.Advance()) {
         if (!it.value()->CheckFlag(HValue::kTruncatingToInt32)) {
           does_deopt = true;