[Bug c++/120243] [15/16 Regression] Exception rethrown from coroutine promise type unhandled_exception not caught under -O1

[iains at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=120243

--- Comment #10 from Iain Sandoe <iains at gcc dot gnu.org> ---
(In reply to Jason Merrill from comment #9)
> (In reply to Jason Merrill from comment #8)
> > Iain, will you backport r16-1507?
> 
> Actually, I'll do it.

that's fine too - my plan is to back port the stack of changes made on trunk
rather than doing piecemeal - to try and avoid churn..