MIPS: Implement handlified String::Equals and Name::Equals.

Port r20669 (29a6ec29)

Note:
This commit fixes a typo.

BUG=
R=danno@chromium.org

Review URL: https://codereview.chromium.org/234993003

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@20688 ce2b1a6d-e550-0410-aec6-3dcde31c8c00