[PATCH] Fix _GLIBCXX_DEBUG tests

[François Dumont]

Some tests are XPASS because array assertions have been disabled for a 
good reason in C++11.

I wonder if the respective non-constexpr _GLIBCXX_ASSERTION checks 
shouldn't target C++14 too. At the moment they are failing as expected 
but because of an Undefined Behavior no ?

The other test is failing because of some cleanup in headers which makes 
<memory> include necessary.

     libstdc++: Fix several _GLIBCXX_DEBUG tests

     libstdc++-v3/ChangeLog:

             * testsuite/23_containers/array/debug/back2_neg.cc: target 
c++14 because assertion
             for constexpr is disabled in C++11.
             * testsuite/23_containers/array/debug/front2_neg.cc: Likewise.
             * 
testsuite/23_containers/array/debug/square_brackets_operator2_neg.cc: 
Likewise.
             * 
testsuite/23_containers/vector/debug/multithreaded_swap.cc: Include <memory>
             for shared_ptr.

Ok to commit ?

François

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