MIPS: Adding a type vector to replace type cells.

Port r19244 (08e0afd9)

BUG=
R=plind44@gmail.com

Review URL: https://codereview.chromium.org/159393002

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@19246 ce2b1a6d-e550-0410-aec6-3dcde31c8c00