[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 #8 from Marc Glisse <glisse at gcc dot gnu.org> ---
Created attachment 41431
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=41431&action=edit
Updated version of the reverted patch

Here is an updated version of the reverted patch, which fixes the vector issues
and passes 64 bit bootstrap+testsuite (including ada). It most likely still
fails building ada in 32 bits, since I don't think I changed anything relevant
to that case.