Merged r16224 into 3.19 branch.

Fix invalid out-of-bounds store in MacroAssembler::Allocate.

BUG=chromium:263515
R=mstarzinger@chromium.org

Review URL: https://codereview.chromium.org/23474012

git-svn-id: https://v8.googlecode.com/svn/branches/3.19@16423 ce2b1a6d-e550-0410-aec6-3dcde31c8c00