[Bug tree-optimization/101830] [12 Regression] Incorrect error messages beginning with r12-2591 (backward jump threader)

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=101830

--- Comment #10 from Bill Schmidt <wschmidt at gcc dot gnu.org> ---
As a reminder, the code compiled fine with no warnings until the rewrite of the
back-threader.  Based on the IL example above, it looks to me like the new pass
is not producing a self-consistent CFG in all cases.