[Bug target/100811] Consider not omitting frame pointers by default on targets with many registers

[fw at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100811

--- Comment #7 from Florian Weimer <fw at gcc dot gnu.org> ---
(In reply to Jakub Jelinek from comment #6)
> I think aarch64 defaults to -fno-omit-frame-pointer anyway.
>     /* Disable fomit-frame-pointer by default.  */
>     { OPT_LEVELS_ALL, OPT_fomit_frame_pointer, NULL, 0 },

It's required by some (all?) AArch64 ABIs, certainly on GNU/Linux.