[x64] Emit vmovss 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 f19c5873f93c6b598fc547a05fdf572e2d2d92fe..f5407494aedc081263f0f7e0e173cfcba806a5c0 100644
--- a/src/compiler/x64/code-generator-x64.cc
+++ b/src/compiler/x64/code-generator-x64.cc
@@ -1322,7 +1322,7 @@ void CodeGenerator::AssembleArchInstruction(Instruction* instr) {
       ASSEMBLE_CHECKED_LOAD_INTEGER(movq);
       break;
     case kCheckedLoadFloat32:
-      ASSEMBLE_CHECKED_LOAD_FLOAT(movss);
+      ASSEMBLE_CHECKED_LOAD_FLOAT(Movss);
       break;
     case kCheckedLoadFloat64:
       ASSEMBLE_CHECKED_LOAD_FLOAT(Movsd);
@@ -1340,7 +1340,7 @@ void CodeGenerator::AssembleArchInstruction(Instruction* instr) {
       ASSEMBLE_CHECKED_STORE_INTEGER(movq);
       break;
     case kCheckedStoreFloat32:
-      ASSEMBLE_CHECKED_STORE_FLOAT(movss);
+      ASSEMBLE_CHECKED_STORE_FLOAT(Movss);
       break;
     case kCheckedStoreFloat64:
       ASSEMBLE_CHECKED_STORE_FLOAT(Movsd);