Bug 916394 - Remove the |it| object from the shell: everything it tests is better-tested with a JSAPI test these days, and it's largely redundant.  r=jorendorff

--HG--
extra : rebase_source : f97d63fdf89a0eacf0f2e091fc3f64aa590371eb
Bug 912701 - Expand some Intl self-hosting assertion messages to aid in debugging-by-eye.  r=trivial

--HG--
extra : rebase_source : 736ee90d527ea2b44cc3929e0ba7a40947842a0b