[clang] [Clang] use const references for function parameters in operator== and operator!= overloads in Redeclarable.h (PR #92963)

[Younan Zhang via cfe-commits]

https://github.com/zyn0217 approved this pull request.

Please explicitly say NFC in the commit title. Otherwise, LGTM

https://github.com/llvm/llvm-project/pull/92963
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