[Bug debug/78685] -Og generates too many "<optimized out>"s

[fredrik at dolda2000 dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78685

--- Comment #11 from Fredrik Tolf <fredrik at dolda2000 dot com> ---
(In reply to Richard Biener from comment #10)
> That is, it is reasonable to lose track of z in
> 
>   int a = (x + z) + b;
> 
> but only after x + z is computed.

Just for the record, I disagree that it's okay to lose z after that. As I
explained in #85059, not having access to variable values after they've been
consumed is one of the absolute main reasons I never use -Og.