[clang-tools-extra] [clang-tidy] The first PR our of many PRs for the "Initialized Class Members" check. (PR #65189)

[Gábor Horváth via cfe-commits]

https://github.com/Xazax-hun approved this pull request.

Code looks fine to me, added some a comment about a potential TODO.

https://github.com/llvm/llvm-project/pull/65189