[Bug target/127538] [16/17 Regression] Failure to merge SUB+CMP --> SUBS on aarch64

[wilco at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=127538

--- Comment #8 from Wilco <wilco at gcc dot gnu.org> ---
That peephole is useless without something forcing the SUB and CMP next to each
other. Eg. https://gcc.gnu.org/bugzilla/show_bug.cgi?id=123792 fails because of
changes in scheduling.