Eric Fiselier 6d95982406 Recommit r286884: P0503R0, adopted in Issaquah, rewords some requirements on nullptr_t and istream_iterator.
No code changes were needed, but I updated a few tests.
Also resolved P0509 and P0521, which required no changes to the library or tests.

This patch was reverted due to llvm.org/PR31016. There is a bug in Clang 3.7
which causes default.pass.cpp to fails. That test is now marked as XFAIL for that
clang version.

This patch was originally authored by Marshall Clow.

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@289708 91177308-0d34-0410-b5e6-96231b3b80d8
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