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Apple Silicon weak memory ordering fix

Jordy Aaldering requested to merge JordyAaldering/sac2c:weak-memory-ordering into develop

Excerpt from Ruben's improved-dispatch MR.

Apple-Silicon weak-memory ordering fix, separable, but please keep. Required for correct concurrent folds on M-series CPUs; without it, partial sums in multi-thread reductions get silently dropped:

Also had to fix a warning that now pops up in stack.c.

Edited by Jordy Aaldering

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