MIPS: Encapsulate type in the PropertyHandlerCompiler.

Port r22700 (587340c)

BUG=
R=akos.palfi@imgtec.com

Review URL: https://codereview.chromium.org/429863003

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@22708 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
Merge remote-tracking branch 'upstream/master'