[v3] throw_allocator duplicate removal

[Benjamin Kosnik]

Yadda yadda, you know the deal: merge __gnu_test::throw_allocator and
pb_ds::test::dbg_ex_allocator into __gnu_cxx::throw_allocator. 

I'll be the first to admit that linkage of this sucker is a total hack
at the moment. Doing a throw_allocator.cc is somewhat problematic as it
includes map instantiations for the data member, which don't really
belong in libstdc++. So, I punt for the time being.

Moving one of these allocators into ext is necessary for pb_ds in debug
mode, as it's assumed that the debugging and throwing allocators are
present.

Minus documentation for the time being.

tested x86/linux
tested x86/linux abi
tested x86/linux performance
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