[Bug target/110096] Would be nice if __builtin_ia32_pause had a portable equivalent as it's applicable to ARM

[pdimov at gmail dot com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110096

--- Comment #3 from Peter Dimov <pdimov at gmail dot com> ---
How does the user know when to include `arm_acle.h`?