[Bug target/107563] __builtin_shufflevector fails to use pshufb and pshufd instructions under default x86_64 compilation toggle which is the sse2 one

[unlvsur at live dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107563

--- Comment #1 from cqwrteur <unlvsur at live dot com> ---
see

https://godbolt.org/z/1aM57z7jn

vs

https://godbolt.org/z/b356qzrMY

While clang does the right thing here

https://godbolt.org/z/hnfrnb694