[libcxx-commits] [libcxx] [libc++][NFC] Use `if constexpr` instead of SFINAE to simplify shared_ptr (PR #113495)

[Louis Dionne via libcxx-commits]

ldionne wrote:

@philnik777 This doesn't seem to work in C++03 mode. I thought you mentioned something along the lines that this should be working in all standard modes. Did I invent that?

https://github.com/llvm/llvm-project/pull/113495