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

R=bmeurer@chromium.org
TEST=test262-es6/language/expressions/addition/S9.3_A4.1_T2

Review URL: https://codereview.chromium.org/1071543003

Cr-Commit-Position: refs/heads/master@{#27663}

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);

test/test262-es6/test262-es6.status

@@ -34,7 +34,6 @@
   'intl402/12.2.3_b': [FAIL],
 
   # TODO(mstarzinger): Optimizing top-level code found some issues. Fix!
-  'language/expressions/addition/S9.3_A4.1_T2': [PASS, NO_VARIANTS],
   'language/expressions/addition/S11.6.1_A2.2_T2': [PASS, NO_VARIANTS],
   'language/expressions/addition/S11.6.1_A3.2_T2.2': [PASS, NO_VARIANTS],
   'language/expressions/addition/S11.6.1_A3.2_T2.4': [PASS, NO_VARIANTS],

test/test262/test262.status

@@ -33,7 +33,6 @@
   '15.5.4.9_CE': [['no_i18n', SKIP]],
 
   # TODO(mstarzinger): Optimizing top-level code found some issues. Fix!
-  'S9.3_A4.1_T2': [PASS, NO_VARIANTS],
   'S11.6.1_A2.2_T2': [PASS, NO_VARIANTS],
   'S11.6.1_A3.2_T2.2': [PASS, NO_VARIANTS],
   'S11.6.1_A3.2_T2.4': [PASS, NO_VARIANTS],