[libcxx-commits] [libcxx] [libc++][unordered_map] Applied `[[nodiscard]]` (PR #170423)

[Thibault Monnier via libcxx-commits]

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Thibault-Monnier wrote:

Please explain. `std::unordered_multimap::empty` has been marked `[[nodiscard]]` since 17e0686, and this PR only changes `std::unordered_map`.

https://github.com/llvm/llvm-project/pull/170423