Add serializer support for builtins pointed by inner pointer and root objects pointed to by code for the out-of-line constant pool.

This is required for test-serialize tests which fail at the DCHECK on L1874 of serialize.cc otherwise.

R=yangguo@chromium.org

Review URL: https://codereview.chromium.org/475753002

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@23242 ce2b1a6d-e550-0410-aec6-3dcde31c8c00