Prepare push to trunk.  Now working on version 3.22.6.

R=mvstanton@chromium.org

Review URL: https://codereview.chromium.org/25462003

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@17026 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
Print out how many AllocationMementos were found on a scavenge of new
space. This is useful because the unrooted mementos affect heap
decisions like pretenuring mode, and helps to gauge the effectiveness
of allocation-site feedback.

R=hpayer@chromium.org

Review URL: https://codereview.chromium.org/25273002

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@17027 ce2b1a6d-e550-0410-aec6-3dcde31c8c00