[Bug middle-end/128111] Add support for __builtin_clmulg

[ktkachov at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=128111

--- Comment #16 from ktkachov at gcc dot gnu.org ---
Implemented the optabs for AArch64 with Neon and SVE2 PMULL