[clang] [llvm] [Clang] [OpenMP] Add support for '#pragma omp stripe'. (PR #119891)

[Zahira Ammarguellat via cfe-commits]

zahiraam wrote:

> @zahiraam I've reverted your PR. I'm happy to test your revised version though my build environment is no secret -- `-DLLVM_ENABLE_WERROR=On` along with clang as the host compiler.

Sorry about that! I will fix the error and merge it back.

https://github.com/llvm/llvm-project/pull/119891