[clang] [C] Disallow declarations where a statement is required (PR #92908)

[Erich Keane via cfe-commits]

https://github.com/erichkeane commented:

The original patch changed some of the ParsedStmtContext's in ParseOMP that might need to be changed back?  Looking back, I think the intent there was in part to not specify OMP standalone directives, so that part should be reverted as well perhaps?



https://github.com/llvm/llvm-project/pull/92908