[Bug target/63359] aarch64: 32bit registers in inline asm

[glisse at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63359

--- Comment #7 from Marc Glisse <glisse at gcc dot gnu.org> ---
(In reply to Richard Earnshaw from comment #3)
> I'm not so sure about a warning, however.  I could envisage cases where the
> warning would be incorrect and avoiding it would lead to code pessimisation.

I don't insist on the warning, I might not have needed it with a proper doc
(that explains both that "r" is reserved to 64 bits (gcc won't adapt to the
type of the argument) and that there is a 'w' modifier to get 32 bits).