Flag for serialization when compiling code stubs if --serialize-toplevel.

R=mvstanton@chromium.org
BUG=v8:3465
LOG=N

Review URL: https://codereview.chromium.org/419503002

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@22596 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
Use heap iterator in store buffer when page was swept precisely.

BUG=
R=rmcilroy@chromium.org

Committed: https://code.google.com/p/v8/source/detail?r=22592

Review URL: https://codereview.chromium.org/413693002

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@22597 ce2b1a6d-e550-0410-aec6-3dcde31c8c00