[clang-tools-extra] [clang-tidy] Add support for in-class initializers in readability-redundant-member-init (PR #77206)

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https://github.com/phyBrackets commented:

Thank You @PiotrZSL . Patch looks good to me. Just a couple of nit picks if it's okay for you.

https://github.com/llvm/llvm-project/pull/77206