[Bug bootstrap/80887] gnat bootstrap fails at s-regpat.o: raised STORAGE_ERROR : stack overflow or erroneous memory access

[glisse at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80887

--- Comment #4 from Marc Glisse <glisse at gcc dot gnu.org> ---
Created attachment 41427
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=41427&action=edit
Reduced version of s-regpat.ad[bs]