Revert "Also mark as prototype when passing in while creating a function."

Breaks GC stress ARM64.

TBR=verwaest@chromium.org
BUG=

Review URL: https://codereview.chromium.org/439983002

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@22843 ce2b1a6d-e550-0410-aec6-3dcde31c8c00