X87: Clean up the global object naming madness.

port r22117

original message:

  Clean up the global object naming madness.

BUG=
R=weiliang.lin@intel.com

Review URL: https://codereview.chromium.org/362943002

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

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@22140 ce2b1a6d-e550-0410-aec6-3dcde31c8c00