X87: Fix computed properties on object literals with a double as propertyname.

port r22255.

original commit message:

  Fix computed properties on object literals with a double as propertyname.

BUG=
R=weiliang.lin@intel.com

Review URL: https://codereview.chromium.org/379513002

Patch from Chunyang Dai <chunyang.dai@intel.com>.

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@22261 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/x87/full-codegen-x87.cc

@@ -1643,8 +1643,8 @@ void FullCodeGenerator::VisitObjectLiteral(ObjectLiteral* expr) {
         VisitForStackValue(key);
         VisitForStackValue(value);
         if (property->emit_store()) {
-          __ push(Immediate(Smi::FromInt(NONE)));  // PropertyAttributes
-          __ CallRuntime(Runtime::kAddProperty, 4);
+          __ push(Immediate(Smi::FromInt(SLOPPY)));  // Strict mode
+          __ CallRuntime(Runtime::kSetProperty, 4);
         } else {
           __ Drop(3);
         }