X87: Support count operations on super named properties.

port r24290.

original commit message:

   Support count operations on super named properties.

BUG=
R=weiliang.lin@intel.com

Review URL: https://codereview.chromium.org/612873003

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

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@24304 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
[turbofan] cleanup x64 code generator a little

R=bmeurer@chromium.org

BUG=

Review URL: https://codereview.chromium.org/612573004

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@24305 ce2b1a6d-e550-0410-aec6-3dcde31c8c00