[ia32] Fix MacroAssembler::Move for int64 to float64 moves.

src/ia32/macro-assembler-ia32.cc

Index: src/ia32/macro-assembler-ia32.cc
diff --git a/src/ia32/macro-assembler-ia32.cc b/src/ia32/macro-assembler-ia32.cc
index 1bd31b32ecd27e21ebf0b53a0a67b9ffe143d18a..81438c3046e3b6e6f094ba988cde615bcf36d6a2 100644
--- a/src/ia32/macro-assembler-ia32.cc
+++ b/src/ia32/macro-assembler-ia32.cc
@@ -2377,11 +2377,11 @@ void MacroAssembler::Move(XMMRegister dst, uint32_t src) {
 
 
 void MacroAssembler::Move(XMMRegister dst, uint64_t src) {
-  uint32_t lower = static_cast<uint32_t>(src);
-  uint32_t upper = static_cast<uint32_t>(src >> 32);
-  if (upper == 0) {
-    Move(dst, lower);
+  if (src == 0) {
+    pxor(dst, dst);
   } else {
+    uint32_t lower = static_cast<uint32_t>(src);
+    uint32_t upper = static_cast<uint32_t>(src >> 32);
     unsigned cnt = base::bits::CountPopulation64(src);
     unsigned nlz = base::bits::CountLeadingZeros64(src);
     unsigned ntz = base::bits::CountTrailingZeros64(src);