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

[Hristo Hristov via cfe-commits]

Zingam wrote:

@petrhosek According to the log, the tests in this patch pass. Could you please try again. I'll wait a while and if there is not negative feedback I'll reland the patch.

> https://logs.chromium.org/logs/fuchsia/led/phosek_google.com/62644843c966785c9dedf065a79d80df8734b4df5ff7703ea3c2a2b5643cec05/+/u/clang/test/stdout is the full log.

```
 PASS: llvm-libc++-static-clangcl.cfg.in :: std/utilities/format/format.arguments/format.arg/visit.pass.cpp (8505 of 9639)
 PASS: llvm-libc++-static-clangcl.cfg.in :: std/utilities/format/format.arguments/format.arg/visit_format_arg.pass.cpp (8506 of 9639)
 PASS: llvm-libc++-static-clangcl.cfg.in :: std/utilities/format/format.arguments/format.arg/visit.return_type.pass.cpp (8537 of 9639)
 PASS: llvm-libc++-static-clangcl.cfg.in :: std/utilities/format/format.arguments/format.arg/visit_format_arg.deprecated.verify.cpp (8439 of 9639)
```



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