[llvm] [openmp] [OpenMP][clang] 6.0: num_threads strict (part 2: device runtime) (PR #146404)

[Shilei Tian via llvm-commits]

shiltian wrote:

A follow-up patch will also need to update `llvm/lib/Transforms/IPO/OpenMPOpt.cpp` accordingly; otherwise the 6.0 interface would not be recognized by OpenMPOpt.

https://github.com/llvm/llvm-project/pull/146404