MIPS: Migrate instance of deprecated maps in HCheckMaps.

Port r16057 (b73ae514)

Original commit message:
Currently only direct map checks are supported. Otherwise only polymorphic cases with a generic fallback behave properly, regular polymorphic cases still need to be adapted.

BUG=

Review URL: https://codereview.chromium.org/22254007

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@16062 ce2b1a6d-e550-0410-aec6-3dcde31c8c00