Version 3.26.6.1 (merged r20491)

MIPS: Check in Lithium that allocation size in Smi range.

TBR=jochen@chromium.org
BUG=

Review URL: https://codereview.chromium.org/225503002

git-svn-id: https://v8.googlecode.com/svn/trunk@20499 ce2b1a6d-e550-0410-aec6-3dcde31c8c00