MIPS: Support count operations on super named properties.

Port r24290 (98dc7ec)

BUG=v8:3330
LOG=N
R=paul.lind@imgtec.com

Review URL: https://codereview.chromium.org/609403002

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@24295 ce2b1a6d-e550-0410-aec6-3dcde31c8c00