Fixing mozilla test failures regarding Math.pow.

src/ia32/lithium-codegen-ia32.cc

Index: src/ia32/lithium-codegen-ia32.cc
diff --git a/src/ia32/lithium-codegen-ia32.cc b/src/ia32/lithium-codegen-ia32.cc
index 2925dcde950175485607cf4e42f50c03366334fb..67feb333e083ae06c971078cbdb457e9e0ee78b5 100644
--- a/src/ia32/lithium-codegen-ia32.cc
+++ b/src/ia32/lithium-codegen-ia32.cc
@@ -2950,7 +2950,10 @@ void LCodeGen::DoMathPowHalf(LMathPowHalf* instr) {
   __ movd(xmm_scratch, scratch);
   __ cvtss2sd(xmm_scratch, xmm_scratch);
   __ ucomisd(input_reg, xmm_scratch);
+  // Comparing -Infinity with NaN results in "unordered", which sets the
+  // zero flag as if both were equal.  However, it also sets the carry flag.
   __ j(not_equal, &sqrt, Label::kNear);
+  __ j(carry, &sqrt, Label::kNear);
   // If input is -Infinity, return Infinity.
   __ xorps(input_reg, input_reg);
   __ subsd(input_reg, xmm_scratch);