Merged r14010 into 3.17 branch.

Disable weak embedded maps because of crashes.

BUG=172489,217858

R=danno@chromium.org

Review URL: https://codereview.chromium.org/13157003

git-svn-id: https://v8.googlecode.com/svn/branches/3.17@14097 ce2b1a6d-e550-0410-aec6-3dcde31c8c00