[committed] libstdc++: Add default_sentinel support to stream iterators

[Jonathan Wakely]

On 24/02/20 13:40 +0000, Jonathan Wakely wrote:
>Missing pieces of P0896R4 "The One Ranges Proposal" for C++20.
>
>	* include/bits/stream_iterator.h (istream_iterator(default_sentinel_t)):
>	Add constructor.
>	(operator==(istream_iterator, default_sentinel_t)): Add operator.
>	(ostream_iterator::difference_type): Define to ptrdiff_t for C++20.
>	* include/bits/streambuf_iterator.h
>	(istreambuf_iterator(default_sentinel_t)): Add constructor.
>	(operator==(istreambuf_iterator, default_sentinel_t)): Add operator.
>	* testsuite/24_iterators/istream_iterator/cons/sentinel.cc:
>	New test.
>	* testsuite/24_iterators/istream_iterator/sentinel.cc: New test.
>	* testsuite/24_iterators/istreambuf_iterator/cons/sentinel.cc:
>	New test.
>	* testsuite/24_iterators/istreambuf_iterator/sentinel.cc: New test.

This fixes a dumb mistake in that commit.

Tested powerpc64le-linux, committed to master.


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