Version 3.28.23.1 (merged r22386, r22396)

MIPS: Remove ASSERT since there are tons of different ASSIGN variants

MIPS: Use register parameters in ElementsTransitionGenerator.

R=machenbach@chromium.org
BUG=

Review URL: https://codereview.chromium.org/395743003

git-svn-id: https://v8.googlecode.com/svn/trunk@22400 ce2b1a6d-e550-0410-aec6-3dcde31c8c00