Add ishell@ to OWNERS.

TBR=danno@chromium.org

Review URL: https://codereview.chromium.org/32523002

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@17296 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
Handlify PropertyCell::SetValueInferType and friends.

This finally gets rid of the pesky trampoline in SetValueInferType and
enforces the layering between PropertyCell and Heap. It requires full
handlification of NewGlobalObject as well, which is only used when the
snapshot is created at compile-time.

R=rossberg@chromium.org

Review URL: https://codereview.chromium.org/28783002

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@17297 ce2b1a6d-e550-0410-aec6-3dcde31c8c00