Version 3.19.18.4.

Merged r15254 into trunk branch.

Handle MONOMORPIC loads where type feedback is code stub

R=jkummerow@chromium.org

Review URL: https://codereview.chromium.org/17351011

git-svn-id: https://v8.googlecode.com/svn/trunk@15255 ce2b1a6d-e550-0410-aec6-3dcde31c8c00