MIPS: Generalizing remaining Allocate functions in the macro assemblers used in pretenuring.

Port r14065 (f09e7e38)

BUG=

Review URL: https://codereview.chromium.org/12855004
Patch from Akos Palfi <palfia@homejinni.com>.

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@14073 ce2b1a6d-e550-0410-aec6-3dcde31c8c00