Handlify JSObject::AddFastPropertyUsingMap method.

R=yangguo@chromium.org

Review URL: https://codereview.chromium.org/24195003

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@16801 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
Turn of polymorphic getter inlining since it breaks webkit tests

BUG=
R=titzer@chromium.org

Review URL: https://chromiumcodereview.appspot.com/23526063

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@16804 ce2b1a6d-e550-0410-aec6-3dcde31c8c00