[Bug bootstrap/90418] [10 Regression] powerpc-darwin9 bootstrap fails after r271013

[dje at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=90418

--- Comment #11 from David Edelsohn <dje at gcc dot gnu.org> ---
Created attachment 46345
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=46345&action=edit
AIX EH sibcall patch

This patch seems to fix the EH failures on AIX.

Because of Darwin use of save_world, Darwin may need the more invasive change
to disable sibcalls.