[clang-tools-extra] [clang-tidy][NFC] fix compilation by disambiguating equality operator (PR #147048)

[Julian Schmidt via cfe-commits]

5chmidti wrote:

> > That's probably happening due to incomplete C++20 support in either Clang 14 or the GNU libstdc++ 12.
> 
> Current standard that LLVM use is c++17. But we generally should support compilers at [least 3 years of compilers](https://llvm.org/docs/DeveloperPolicy.html#updating-toolchain-requirements).

And we also want to support being able to compile with C++20. I think there are build bots for that set up.

> > Would it be possible to cherry-pick the fix to the release/20.x branch?
> 
> I don't have much knowledge on cherry-picking to release, but the latest release of 20.x could be on Jul 8th (if it even happens, see https://llvm.org/). I have a slight feeling that it's not worth cherry-picking, If LLVM is compiled from source, would it be feasible to just use 21st LLVM branch that will be released soon, [gjasny](https://github.com/gjasny)?

The compile error is in a cpp file, so it would only happen to people compiling the clang-tidy libs with C++20 which has an even smaller chance of happening, but still. IMO this should just go into LLVM 20, it's a trivial fix.

https://github.com/llvm/llvm-project/pull/147048