[libcxx-commits] [libcxx] [libc++] Decouple `optional<T>` and `optional<T&>` base classes (PR #215012)

[A. Jiang via libcxx-commits]

================

----------------
frederick-vs-ja wrote:

I'd like to directly inline functions into `optional<T>` in this PR. Maybe it would be better to change the PR title to "Refactor `optional<T>` and `optional<T&>` base classes".

https://github.com/llvm/llvm-project/pull/215012