[Bug target/91143] Power VSX SIMD ABI design for libmvec

[shawn at git dot icu]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91143

--- Comment #4 from Shawn Landden <shawn at git dot icu> ---
Nevermind, if it is roughly compatible with the ARM or x86 one it doesn't
effect me.