Konstantin Varlamov bc4d2e7051 [libc++] Fix _IterOps::__iter_move to support proxy iterators.
The return type was specified incorrectly for proxy iterators that
define `reference` to be a class that implicitly converts to
`value_type`. `__iter_move` would end up returning an object of type
`reference` which would then implicitly convert to `value_type`; thus,
the function will return a `value_type&&` rvalue reference to the local
temporary.

Differential Revision: https://reviews.llvm.org/D130197
2022-07-20 13:19:00 -07:00
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