[Bug tree-optimization/101621] gcc cannot optimize int8_t vector assign with subscription to shuffle

[yumeyao at gmail dot com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=101621

--- Comment #1 from YumeYao <yumeyao at gmail dot com> ---
https://gcc.godbolt.org/z/a47Enb9oK

16-bytes (AVX) version added.