[clang] [flang] [llvm] [CLANG][OpenMP] Add support for OpenMP6.0 transparent clause (PR #166810)

[Zahira Ammarguellat via llvm-commits]

zahiraam wrote:

> Runtime changes proposed here: #168873

@alexey-bataev Would adding the flag in #168873 be enough for this PR to be merged?

https://github.com/llvm/llvm-project/pull/166810