[clang] [clang] Sequence C++20 Parenthesized List Init (PR #83476)

[Richard Smith via cfe-commits]

https://github.com/zygoloid commented:

Thanks!

[I'm not sure when I'll have time to circle back to this, so I'd be happy for someone else to finish the review and approve.]

https://github.com/llvm/llvm-project/pull/83476