Merged r16566 into trunk branch.

Fix polymorphic INTERCEPTOR StoreICs on ARM/MIPS

BUG=chromium:284998
R=verwaest@chromium.org

Review URL: https://codereview.chromium.org/23818004

git-svn-id: https://v8.googlecode.com/svn/trunk@16567 ce2b1a6d-e550-0410-aec6-3dcde31c8c00