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

[Aaron Puchert via cfe-commits]

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aaronpuchert wrote:

We don't deduplicate "requires" attributes but check them directly. The result is not ideal, but this is slightly more efficient, and the duplicate warning is probably not a big issue. Especially since usually the attributes are not repeated.

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