Deal with filler object map pointers in the ool constant pool correctly.

This CL updates
StoreBuffer::FindPointersToNewSpaceOnPage such that it skips  constant pool array objects.  Constant Pool Arrays should never have pointers to the new space and might contain pointers to the FreeSpace map (e.g., due to code
being generated which needs to do a map-check on a FreeSpace object) which would incorrectly treated as a filler object if processed by FindPointersToNewSpaceOnPage().

R=hpayer@chromium.org

Review URL: https://codereview.chromium.org/183553003

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@19771 ce2b1a6d-e550-0410-aec6-3dcde31c8c00