It was updating the same pointer twice (was using InNewSpace instead of
InFromSpace).

Also make FLAG_never_compact supercede FLAG_always_compact.

R=erik.corry@gmail.com
BUG=v8:1721

Review URL: http://codereview.chromium.org/8041017

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@9423 ce2b1a6d-e550-0410-aec6-3dcde31c8c00