[clang] [OpenMP] Support for `nothing` in `metadirective` (PR #73690)

[Alexey Bataev via cfe-commits]

================
@@ -12,7 +12,6 @@ int mixed() {
     x=d;
   }
 
-// expected-error at +2 {{#pragma omp nothing' cannot be an immediate substatement}}
----------------
alexey-bataev wrote:

I think this error message should remain

https://github.com/llvm/llvm-project/pull/73690