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This PR fixes an ambiguous call encountered when using the `std::ranges::find` or `std::find` algorithms with `vector<bool>` with small `allocator_traits::size_type`s, an issue reported in #122528. The ambiguity arises from integral promotions during the internal bitwise arithmetic of the `find` algorithms when applied to `vector<bool>` with small integral `size_type`s. This leads to multiple viable candidates for small integral types: __libcpp_ctz(unsigned), __libcpp_ctz(unsigned long), and __libcpp_ctz(unsigned long long), none of which represent a single best viable match, resulting in an ambiguous call error. To resolve this, we propose invoking an internal function __countr_zero as a dispatcher that directs the call to the appropriate overload of __libcpp_ctz. Necessary amendments have also been made to __countr_zero.