[libcxx-commits] [libcxx] [libc++] Make list constexpr as part of P3372R3 (PR #129799)

[Louis Dionne via libcxx-commits]

https://github.com/ldionne approved this pull request.

This LGTM modulo the remaining comments and rebasing onto `main`.

https://github.com/llvm/llvm-project/pull/129799