[patch] Implement move semantics for iostreams

[Jonathan Wakely]

On 23/09/14 11:48 +0200, Andreas Schwab wrote:
>FAIL: g++.old-deja/g++.law/ctors10.C  -std=c++11 (test for excess errors)
>Excess errors:
>/daten/aranym/gcc/gcc-20140923/gcc/testsuite/g++.old-deja/g++.law/ctors10.C:16:46: error: call of overloaded 'basic_ostream(NULL)' is ambiguous

Fixed by this patch.

Tested x86_64-linux (including the g++ tests this time), committed to
trunk.
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