MIPS: Move function prototype handling into a special handler rather than IC.

Port r22526 (d4c953e)

Original commit message:
Adjust hydrogen handling of function.prototype to be based on map feedback. Handle non-instance prototype loading using an IC rather than in the hydrogen instruction. In the future, remove the special instruction and replace by multiple hydrogen instructions.

BUG=
R=paul.lind@imgtec.com

Review URL: https://codereview.chromium.org/414463002

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@22534 ce2b1a6d-e550-0410-aec6-3dcde31c8c00