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

[Aaron Puchert via cfe-commits]

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aaronpuchert wrote:

> Is there any sort of facility to deduplicate capabilities?

The existing code uses `CapExprSet::push_back_nodup`.



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