[clang] [llvm] [mlir] [openmp] [OpenMP][offload] Cross-team reductions with variable number of teams (PR #195102)

[Robert Imschweiler via cfe-commits]

ro-i wrote:

Fixed https://github.com/llvm/llvm-project/pull/195940 to only include a non-performance test and opened https://github.com/llvm/llvm-project/pull/196061 to first land the inlining.

https://github.com/llvm/llvm-project/pull/195102