MIPS: Implement loads and calls from 'super’.

Port r24078 (b7e601f)

BUG=v8:3330
LOG=N
R=dusan.milosavljevic@imgtec.com

Review URL: https://codereview.chromium.org/586013002

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@24099 ce2b1a6d-e550-0410-aec6-3dcde31c8c00