[lldb] [libcxx] [libc] [clang] [clang-tools-extra] [libunwind] [compiler-rt] [lld] [flang] [llvm] Reland: [libc++][format] P2637R3: Member visit (std::basic_format_arg) #76449 (PR #79032)

[Hristo Hristov via cfe-commits]

H-G-Hristov wrote:

I noticed some of clang-cl test crashed. I rebased again.

https://github.com/llvm/llvm-project/pull/79032