MIPS: Simplify the deopt entry method.
MIPS: Simplify the deopt entry method.

The t9 register will always hold the address of the current entry when deoptimizing,
so it can be used as the basis of calculation.

BUG=
TEST=

Review URL: https://chromiumcodereview.appspot.com/9546017
Patch from Daniel Kalmar <kalmard@homejinni.com>.

git-svn-id: b158db1e4b4ab85d4c9e510fdef4b1e8c614b15b@10950 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

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