port r24042.

original commit message:

  Convert KeyedLoad indexed interceptor case to a Handler.

  Currently, KeyedLoads on objects with indexed interceptors are handled with a
  special stub. Instead, key on the map and handler mechanism for more uniform
  treatment.

BUG=
R=weiliang.lin@intel.com

Review URL: https://codereview.chromium.org/581273005

Patch from Jing Bao <jing.bao@intel.com>.

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@24063 ce2b1a6d-e550-0410-aec6-3dcde31c8c00