[Bug target/105640] [OpenMP] Context selectors missing for PowerPC

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105640

--- Comment #1 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
It isn't implemented on anything but x86, nvptx and gcn.
https://gcc.gnu.org/legacy-ml/gcc-patches/2019-10/threads.html#02066
has some more details.
aarch64 would be another HPC related target.