MIPS: Minor optimizations in Builtins::Generate_ArgumentsAdaptorTrampoline.
MIPS: Minor optimizations in Builtins::Generate_ArgumentsAdaptorTrampoline.

The branch delay slot is now utilized in a few loops.
This is the cleanup of an old TODO.

BUG=
TEST=

Review URL: https://chromiumcodereview.appspot.com/9618013

git-svn-id: b158db1e4b4ab85d4c9e510fdef4b1e8c614b15b@10949 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

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