[Bug sanitizer/94191] ubsan bootstrap memory hog with -enable-checking=rtl

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94191

--- Comment #1 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Don't do it or buy enough memory.
RTL checking alone already creates lots of basic blocks due to all the checks
it performs (in the code the compiler is compiling) and ubsan as well (in the
instrumentation it adds for it), and when you compile the huge auto-generated
files, it is costly.