[Bug middle-end/81889] [7 Regression] bogus warnings with -Wmaybe-uninitialized -O3

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81889

--- Comment #13 from Richard Biener <rguenth at gcc dot gnu.org> ---
Backport FAILs gcc.dg/tree-ssa/pr61743-2.c.