[PATCH] shared_ptr : atomic ref-counts (TSan)

[Eric Fiselier]

I think a much safer change would be to use the `__atomic_foo` builtins. It means we wouldn't have to change the type stored in `__shared_count` and `__shared_weak_count` and we wouldn't  depend on the `<atomic>` header.

Is there a reason this approach was not taken?


http://reviews.llvm.org/D8147

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