Merged r18483 into 3.22 branch.

Fix selection of popular pages in store buffer.

BUG=331444
LOG=N
R=verwaest@chromium.org

Review URL: https://codereview.chromium.org/143783006

git-svn-id: https://v8.googlecode.com/svn/branches/3.22@18724 ce2b1a6d-e550-0410-aec6-3dcde31c8c00