port r22551.

original commit message:
  Always use the LoadStubCompiler for Load handlers, also for keyedload handlers

BUG=
R=verwaest@chromium.org

Review URL: https://codereview.chromium.org/412903003

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

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@22587 ce2b1a6d-e550-0410-aec6-3dcde31c8c00