Precisely sweep scan on scavenge pages and use heap iterator to iterate over them.

BUG=
R=jarin@chromium.org

Review URL: https://codereview.chromium.org/362313002

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@22154 ce2b1a6d-e550-0410-aec6-3dcde31c8c00