[Bug rtl-optimization/78559] [7 Regression] wrong code due to tree if-conversion?

[bernds at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78559

--- Comment #12 from Bernd Schmidt <bernds at gcc dot gnu.org> ---
Sorry, long pause while editing that comment made me leave out part of what I
was trying to say - I meant only discard notes that reference the CC reg. But
it seems an unnecessary complication.