[libcxx-commits] [libcxx] [libcxx] Avoid hash key in __hash_table::find() if no buckets yet. (PR #126837)

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xbcnn wrote:

We could go ahead to double check `size() != 0` before do actual lookup operations.  Hash table could be already have buckets but still empty. 

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