Arthur O'Dwyer 045781a5ce [libc++] [test] Don't assume iterators are class types.
In particular, `span<int>::iterator` may be a raw pointer type
and thus have no nested typedef `iterator::value_type`. However,
we already know that the value_type we expect for `span<int>` is just `int`.
Fix up all other iterator_concept_conformance tests in the same way.

Differential Revision: https://reviews.llvm.org/D101420
2021-04-28 10:14:14 -04:00
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