[Bug sanitizer/90865] ubsan causes coverage branch errors

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=90865

--- Comment #5 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
There is a way out of this.  Defer building those conditionals till the sanopt
pass, before that have new IFN_UBSAN_* internal calls in the IL like we already
do with IFN_UBSAN_{NULL,BOUNDS,OBJECT_SIZE,PTR,VPTR}.  Another advantage of
doing that would be we would create the ubsan data only for code that actuall
survives till the sanopt pass and is not optimized away before that.