MIPS: Clean up VMState a little bit.
MIPS: Clean up VMState a little bit.

Port r14421 (31cd7dda)

BUG=

Review URL: https://codereview.chromium.org/14483002

git-svn-id: b158db1e4b4ab85d4c9e510fdef4b1e8c614b15b@14429 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

UniversalFuture/moosh,UniversalFuture/moosh,UniversalFuture/moosh,UniversalFuture/moosh