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e53bea5182
This PR fixes an ambiguous call encountered while using the `std::ranges::count` and `std::count` algorithms with `vector<bool>` with small `size_type`s. The ambiguity arises from integral promotions during the internal bitwise arithmetic of the `count` algorithms for small integral types. This results in multiple viable candidates: `__libcpp_popcount(unsigned)`,` __libcpp_popcount(unsigned long)`, and `__libcpp_popcount(unsigned long long)`, leading to an ambiguous call error. To resolve this ambiguity, we introduce a dispatcher function, `__popcount`, which directs calls to the appropriate overloads of `__libcpp_popcount`. This closes #122528.