X87: Add MEGAMORPHIC state support for KeyedStoreIC

port r24500.

original commit message:

  Add MEGAMORPHIC state support for KeyedStoreIC

BUG=
R=weiliang.lin@intel.com

Review URL: https://codereview.chromium.org/642843004

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

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@24506 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
X87: Keyed stores to super where key is a name.

port r24490.

original commit message:
   Keyed stores to super where key is a name.

BUG=
R=weiliang.lin@intel.com

Review URL: https://codereview.chromium.org/649533002

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

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@24507 ce2b1a6d-e550-0410-aec6-3dcde31c8c00