Louis Dionne 7611eb4869 [libc++][NFC] Simplify enable_if for std::copy optimization
Get rid of the __is_trivially_copy_assignable_unwrapped helper, which
is only used in one place, and use __iter_value_type instead of
iterator_traits<T>::value_type.

Differential Revision: https://reviews.llvm.org/D127230
2022-06-08 12:46:08 -04:00
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