MIPS: Add support for Token::NE and Token::NE_STRICT to TokenToCondition.

Port r17239 (c203175f)

Original commit message:
This is required to be able to use these tokens with
HCompareNumericAndBranch.

BUG=
R=plind44@gmail.com

Review URL: https://codereview.chromium.org/27516004

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@17248 ce2b1a6d-e550-0410-aec6-3dcde31c8c00