[patch] Improving shared_ptr for C++0x

[Jonathan Wakely]

In another thread Paolo pointed out DR402, which I hadn't thought of
when implementing _Sp_counted_ptr_inplace.  The two uses of placement
new with the embedded type should be qualified in case the type
defines its own operator new.  The attached testcase verifies this and
I'll add it with the other parts.

Tested again on x86_64/linux - new testcase fails without the
qualifications and passes with.

Jon
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