[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 #3 from Imple Lee <lee.imple at gmail dot com> ---
Oh, I didn't make it clear. I am describing libstdc++'s std::experimental::simd
class.