Fixed minus zero test (fixes v8:2133).

src/ia32/assembler-ia32.cc

Index: src/ia32/assembler-ia32.cc
diff --git a/src/ia32/assembler-ia32.cc b/src/ia32/assembler-ia32.cc
index ea68c5090f9389ed3173a4fa291c4139b3bd4257..f291b05260b141dde99cb81b394529f69ffcc2af 100644
--- a/src/ia32/assembler-ia32.cc
+++ b/src/ia32/assembler-ia32.cc
@@ -2105,6 +2105,16 @@ void Assembler::movmskpd(Register dst, XMMRegister src) {
 }
 
 
+void Assembler::pcmpeqd(XMMRegister dst, XMMRegister src) {
+  ASSERT(CpuFeatures::IsEnabled(SSE2));
+  EnsureSpace ensure_space(this);
+  EMIT(0x66);
+  EMIT(0x0F);
+  EMIT(0x76);
+  emit_sse_operand(dst, src);
+}
+
+
 void Assembler::cmpltsd(XMMRegister dst, XMMRegister src) {
   ASSERT(CpuFeatures::IsEnabled(SSE2));
   EnsureSpace ensure_space(this);