[libcxx-commits] [libcxx] [libc++] Make std::pair trivially copyable if its members are (PR #89652)

[Nico Weber via libcxx-commits]

nico wrote:

The one bit from `__config_site` that's require to trigger this is `#define _LIBCPP_ABI_VERSION 2`.

https://github.com/llvm/llvm-project/pull/89652