Merge atomic counter inc/dec functions and use them consistently #3644
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This is the
flambda-backend
version of ocaml/ocaml#13593, providing a single set of functions for incrementing/decrementing/initialising atomicuintnat
counters, and using them throughout the runtime. A small step towards simplifying and clarifying GC code (the major GC uses the obscurely-namedatomic_fetch_add_verify_ge0
extensively, but only for adding or subtracting 1, and the behaviour matched the existingcaml_atomic_refcount_incr
/_decr
, which was not specific to refcounts).