[clang] [Clang][OpenMP] Fixed an assertion on omp taskloop transparent (PR #200663)

[Zahira Ammarguellat via cfe-commits]

https://github.com/zahiraam approved this pull request.

Looks good. Thanks. Would be nice to add fix for the other directives mentioned by Alexey though. 

https://github.com/llvm/llvm-project/pull/200663