* Consolidated CopyJSObject and CopyJSObjectWithAllocationSite
* Factory.h helper for struct maps.
* BuildFastLiteral shouldn't create allocation sites in pretenuring mode.

BUG=
R=mstarzinger@chromium.org

Review URL: https://codereview.chromium.org/24255005

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@16855 ce2b1a6d-e550-0410-aec6-3dcde31c8c00