MIPS: Fill more branch delay slots.

TEST=
BUG=
R=plind44@gmail.com

Review URL: https://codereview.chromium.org/15967006

Patch from Dusan Milosavljevic <Dusan.Milosavljevic@rt-rk.com>.

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@15011 ce2b1a6d-e550-0410-aec6-3dcde31c8c00