[clang] [clang] WIP: Warn on mismatched RequiresCapability attributes (PR #67520)

[Kevin Wolf via cfe-commits]

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kevmw wrote:

> This example from the failing test should warn I think
> [...]
> Since the definition of foo2 specifies attributes that aren't present in the previous declaration.

Yes, this looks exactly like the thing we want to protect against to me (because chances are that the declaration is actually in a header file and other source files will check their calls only against this declaration, so real bugs can be expected to result from this).

https://github.com/llvm/llvm-project/pull/67520