[Bug inline-asm/87733] local register variable not honored with earlyclobber

[bugdal at aerifal dot cx]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87733

--- Comment #26 from Rich Felker <bugdal at aerifal dot cx> ---
Indeed, I just confirmed that binding the n input to a particular register
prevents the "i" part of the "ir" alternative from working.