[Bug rtl-optimization/91981] Speed degradation because of inlining a register clobbering function

[antoshkka at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91981

--- Comment #4 from Antony Polukhin <antoshkka at gmail dot com> ---
It was broken in GCC-9, GCC-8.3 and below do not have this issue.