[Bug target/80007] --disable-bootstrap with gnat-5 leads to failed gnat-7 build on aarch64

[tulipawn at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80007

--- Comment #9 from PeteVine <tulipawn at gmail dot com> ---
Correction, it was about -fomit-frame-pointer period! Setting the environment
C(XX)FLAGS to that flag alone triggers the bug.