x64: save a bit code size

It would be better use macro always

BUG=
R=verwaest@chromium.org

Review URL: https://chromiumcodereview.appspot.com/100843002

Patch from Weiliang Lin <weiliang.lin@intel.com>.

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@18282 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/x64/lithium-gap-resolver-x64.cc

@@ -198,7 +198,7 @@ void LGapResolver::EmitMove(int index) {
       if (cgen_->IsSmiConstant(constant_source)) {
         __ Move(dst, cgen_->ToSmi(constant_source));
       } else if (cgen_->IsInteger32Constant(constant_source)) {
-        __ movl(dst, Immediate(cgen_->ToInteger32(constant_source)));
+        __ Set(dst, cgen_->ToInteger32(constant_source));
       } else {
         __ Move(dst, cgen_->ToHandle(constant_source));
       }