[PATCH v5 1/3] aarch64: Fix comments for register constraints

[Wilco Dijkstra]

Hi Karl,

> The comments for the "w", "x" and "y" register constraints in
> gcc/config/aarch64/constraints.md were misleading. They apply to SVE
> registers as well as Advanced SIMD and FP registers.

LGTM.

Cheers,
Wilco