[libcxx-commits] [libcxx] [libc++] Avoid key_eq calls in hash_table rehash (PR #216551)

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xbcnn wrote:

`unordered_multiset.bench.cpp` only instantiates `int` keys, where key comparison is effectively identical to hash comparison. Furthermore, these test cases rarely trigger rehashing.

https://github.com/llvm/llvm-project/pull/216551