[clang] [Clang][OpenMP] Skip Sema actions for invalid assumption clauses (PR #212822)

[Shengxin Pei via cfe-commits]

TPPPP72 wrote:

Since your test also covers invalid OpenMP combinations, you could actually just reuse the test file I added in #200663 (Renaming it is better).

I'm not sure if adding these assertions is the right approach, as I haven't consulted the rest of the source code.

https://github.com/llvm/llvm-project/pull/212822