[libcxx-commits] [libcxx] [libcxx] Avoid hash key in __hash_table::find() if it is empty. (PR #126837)

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xbcnn wrote:

OK.  I added `with_expensive_key_empty` to cover the tests and removed `hash_table_find.bench.cpp`

https://github.com/llvm/llvm-project/pull/126837