[clang] [llvm] [mlir] [flang][OpenMP] Support `target enter|update|exit .. nowait` (PR #113305)

[Pranav Bhandarkar via llvm-commits]

https://github.com/bhandarkar-pranav approved this pull request.

A couple of minor nits, that's all.

https://github.com/llvm/llvm-project/pull/113305