Bug 1664357: Inline JSOp::New r=jandem

We already did the hard work to handle `this` creation for transpiling, so inlining is pretty straight-forward.

`patchInlinedReturn` needs to know whether we're calling a derived constructor to avoid repeated bailouts in `MReturnFromCtor`. I used a similar solution to what anba did here: https://phabricator.services.mozilla.com/D58785). Once Ion is gone, we could consider modifying `MReturnFromCtor` instead.

Differential Revision: https://phabricator.services.mozilla.com/D89873