[committed] libstdc++: Implement operator<< for std::unique_ptr (LWG 2948)

[Jonathan Wakely]

On 08/06/20 21:22 +0100, Jonathan Wakely wrote:
>libstdc++-v3/ChangeLog:
>
>	* include/bits/unique_ptr.h (operator<<): Define for C++20.
>	* testsuite/20_util/unique_ptr/io/lwg2948.cc: New test.

Oops, I forgot to add the test adjustments.

Tested x86_64-linux, committed to master.

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