[Bug target/90453] PowerPC/AltiVec VSX: Provide vec_pack/vec_unpackh/vec_unpackl for 32<->64

[slandden at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=90453

--- Comment #2 from Shawn Landden <slandden at gmail dot com> ---
vector unsigned long long unpacked;
vector unsigned int packedl, packedr;

unpacked = vec_pack(packedl, packedr);
packedl = vec_unpackh(unpacked);
packedr = vec_unpackl(unpacked);