[clang-tools-extra] [clang-tidy] Add modernize-default-arg-braced-init check (PR #203474)

[Baranov Victor via cfe-commits]

vbvictor wrote:

If you want to start contributing to clang-tidy, please start small with bugfixes of false positives and gradually increase PR sizes.

I suspect other open PRs from you could be implicitly marked as "extractive" in eyes of maintainers 

https://github.com/llvm/llvm-project/pull/203474