bors e209e85e39 Auto merge of #95183 - ibraheemdev:arc-count-acquire, r=Amanieu
Weaken needlessly restrictive orderings on `Arc::*_count`

There is no apparent reason for these to be `SeqCst`. For reference, [the Boost C++ implementation relies on acquire semantics](f2cc84a23c/include/boost/smart_ptr/detail/sp_counted_base_std_atomic.hpp (L137-L140)).
2022-05-06 14:53:24 +00:00
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