add uncached Function::New

TBR=mstarzinger@chromium.org
BUG=

Review URL: https://codereview.chromium.org/24071002

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@16586 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
thread isolate for HConstant::handle

R=svenpanne@chromium.org
BUG=

Review URL: https://codereview.chromium.org/24027004

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@16587 ce2b1a6d-e550-0410-aec6-3dcde31c8c00