X87: Added vector-based loadic hydrogen stubs. Not yet callable.

X87: Added vector-based loadic hydrogen stubs. Not yet callable.

port r23405.

original commit message:
  Added vector-based loadic hydrogen stubs. Not yet callable.
  The next step is to integrate the use of vector[slot] into the IC
  infrastructure so it can do the right thing for a vector-based ic.
   Then these stubs can be installed. For now, they immediately bail
   out to the miss handler.

BUG=

[chunyang.dai, 2014-08-27 07:56:25]

chunyang.dai@intel.com changed reviewers:
+ mvstanton@chromium.org, weiliang.lin@intel.com

[chunyang.dai, 2014-08-27 07:56:49]

weiliang. 
PTAL.
thanks.

[Weiliang, 2014-08-27 07:57:40]

lgtm

[Weiliang, 2014-08-27 08:01:38]

Committed as r23433