[Bug target/114417] simd parameters are passed by memory on x64 , not using the available sse registers

[lee.imple at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=114417

--- Comment #2 from Imple Lee <lee.imple at gmail dot com> ---
(In reply to Andrew Pinski from comment #1)
> I doubt this can change since this is the abi gcc decided on a long time ago.

If we implement the simd class as a wrapper around a vector, the parameter can
still be passed by sse registers, so I think there may be an implementation
issue in libstdc++'s implementation of stdx::simd.

https://godbolt.org/z/a6s67zzc7