MIPS: port Stop using with explicitly to implement try/catch.

MIPS: port Stop using with explicitly to implement try/catch.

Port r8224 (bdec5d6)

Original commit message:
The AST for TryCatch gives us enough structure that we do not need to expand
it to explicitly include a with. Try/catch is still handled the same as
before at runtime.

BUG=
TEST=

Committed: http://code.google.com/p/v8/source/detail?r=8226

[Søren Thygesen Gjesse, 2011-06-09 06:59:26]

LGTM

I will commit it.