Rollup merge of #152195 - ZuseZ4:update-offload-llvm22-A, r=jieyouxu

update openmp/offload builds to LLVM 22, Part 1

This part of the update of OpenMP/Offload to LLVM 22 does not depend on a backport in the future LLVM release candidate 3. Let's therefore merge it first, to unblock existing users/developers.

r? @jieyouxu

Author: JonathanBrouwer