[Bug sanitizer/83219] [8 regression] c-c++-common/ubsan/unreachable-2.c fails starting with r255201

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83219

--- Comment #2 from Richard Biener <rguenth at gcc dot gnu.org> ---
Hum.  Where do we "instrument" __builtin_unreachable () for UBSAN?  EVRP
is now more aggressive with recording ranges, where VRP does it only for
SSA names used dominated by an edge EVRP does it always.  This makes us
optimize away the test before RTL expansion (where the instrumentation
happens?).