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

[segher at gcc dot gnu.org]

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

--- Comment #31 from Segher Boessenkool <segher at gcc dot gnu.org> ---
An asm clobber just means "may be an output", and no operand will be assigned
a register mentioned in a clobber.  There is no magic.