Reland "Fix property enum cache creation to include only own properties"

Reland r20308 (reverted by r20310).

TBR=verwaest@chromium.org

Review URL: https://codereview.chromium.org/216383003

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@20321 ce2b1a6d-e550-0410-aec6-3dcde31c8c00