[Bug bootstrap/63695] [5 Regression] Bootstrapping with Ada is broken at r216942

[dominiq at lps dot ens.fr]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63695

--- Comment #4 from Dominique d'Humieres <dominiq at lps dot ens.fr> ---
> OK, so this confirms my suspicion: you had an unsuitable snapshot as your
> Ada bootstrap compiler.
>
> Arno

Well, this does not answer my underlying question: what made my bootstrap
compiler unsuitable after the batch of commits circa 216930?