[x64] Make use of vucomiss and vucomisd when AVX is enabled.

src/compiler/x64/code-generator-x64.cc

Index: src/compiler/x64/code-generator-x64.cc
diff --git a/src/compiler/x64/code-generator-x64.cc b/src/compiler/x64/code-generator-x64.cc
index 9154172a292c0daffcc94971e6f9b81387dbe2a0..532da72c289b217b81029c704add621a19762873 100644
--- a/src/compiler/x64/code-generator-x64.cc
+++ b/src/compiler/x64/code-generator-x64.cc
@@ -785,7 +785,7 @@ void CodeGenerator::AssembleArchInstruction(Instruction* instr) {
       }
       break;
     case kSSEFloat32Cmp:
-      ASSEMBLE_SSE_BINOP(ucomiss);
+      ASSEMBLE_SSE_BINOP(Ucomiss);
       break;
     case kSSEFloat32Add:
       ASSEMBLE_SSE_BINOP(addss);
@@ -829,7 +829,7 @@ void CodeGenerator::AssembleArchInstruction(Instruction* instr) {
       ASSEMBLE_SSE_UNOP(Cvtss2sd);
       break;
     case kSSEFloat64Cmp:
-      ASSEMBLE_SSE_BINOP(ucomisd);
+      ASSEMBLE_SSE_BINOP(Ucomisd);
       break;
     case kSSEFloat64Add:
       ASSEMBLE_SSE_BINOP(addsd);