[Sheriff] Revert "MIPS: Ensure double aligned allocations through runtime routines."

This reverts commit r17809 for breaking the build.

TBR=plind44@gmail.com,
BUG=

Review URL: https://codereview.chromium.org/74803002

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@17810 ce2b1a6d-e550-0410-aec6-3dcde31c8c00