[v3] tracker_allocator duplicate removal

[Benjamin Kosnik]

Second to last one of these.

This merges two competing tracker allocators from libstdc++'s
testsuite. I suppose we could put this in ext too, but I'm deciding
against it at the moment. Right now, we have three memory-debugging
allocators:

__gnu_cxx::debug_allocator
__gnu_cxx::throw_allocator
__gnu_test::tracker_allocator

The first one doesn't do much, the second two do.

tested x86/linux

-benjamin
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