[Bug target/102812] Unoptimal (and wrong) code for _Float16 insert

[crazylht at gmail dot com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102812

--- Comment #1 from Hongtao.liu <crazylht at gmail dot com> ---
ix86_get_ssemov needs to be updated for V8HF/V16HF since they cound be existed
under TARGET_SSE2/TARGET_AVX.