[Bug target/102986] [12 Regression] ICE: in expand_shift_1, at expmed.c:2671 with a negative shift of a vector

[roger at nextmovesoftware dot com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102986

--- Comment #5 from Roger Sayle <roger at nextmovesoftware dot com> ---
Patch proposed:
https://gcc.gnu.org/pipermail/gcc-patches/2021-October/582931.html