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

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xbcnn wrote:

Seems it performs better on macos (Apple Silicon), delivering a stable `~17–20%` speedup on large container rehashes, while showing no statistically significant change on Linux (where the 95% confidence interval spans [-10.5%, +9.9%]).

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