std::pair copy and move constructor

[François Dumont]

Hi

     I had a problem with the result of 
std::is_copy_assignable<std::pair<const int, int>>::type which used to 
be true_type. So here is a patch to fix that.

2013-02-15  François Dumont  <fdumont@gcc.gnu.org>

     * include/bits/stl_pair.h (pair): Use default implementation for
     copy and move constructors.
     * testsuite/20_util/pair/is_copy_assignable.cc: New.
     * testsuite/20_util/pair/is_move_assignable.cc: New.

     I kept some checks commented. For is_copy_assignable.cc is looks 
like DeletedMoveAssignClass has also its copy assignment operator 
deleted. In is_move_assignable.cc even when pair is only composed of 
DeletedMoveAssignClass it looks like the pair still have a move 
assignment operator.

     I was surprised to see that those operator were not already using 
the default implementation so sorry if I miss the mails explaining why.

     Tested under Linux x86_64.

François

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