Cheap acquire loads

[Florian Weimer]

Do we have a preprocessor macro (or anything else which evaluates to a
compile-time constant) which indicates whether acquire loads are cheap
(as cheap as regular loads, ignoring compiler barriers)?

If acquire loads are cheap, it may make sense to use them in
single-threaded mode, too, rather than avoiding them there.  This might
get rid of the single-threaded check in some cases.

Thanks,
Florian
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