[Bug c++/71892] Recent optimization changes introduce bugs

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=71892

--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
There is an option to disable both of these. Also the null pointer one had
always been there. Just it got smarter.