[llvm][ADT] Implement IntrusiveRefCntPtr::useCount()
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This function has the same semantics as `std::shared_ptr<T>::use_count()`, and enables implementing copy-on-write semantics.
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benlangmuir
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This function has the same semantics as `std::shared_ptr<T>::use_count()`, and enables implementing copy-on-write semantics.
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This function has the same semantics as `std::shared_ptr<T>::use_count()`, and enables implementing copy-on-write semantics.
jansvoboda11
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This function has the same semantics as `std::shared_ptr<T>::use_count()`, and enables implementing copy-on-write semantics.
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This function has the same semantics as
std::shared_ptr<T>::use_count(), and enables implementing copy-on-write semantics.