make strongly_atomic_atomic more convenient

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passed #6312
fp-timing
build-coq.8.6.1

00:03:02

passed #6311
fp-timing
build-coq.8.7.0

00:02:46

 
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opam

00:00:14

passed #6314
reverse-deps

00:00:14

 
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passed #6315
fp-timing
build-coq.8.7.dev

00:03:06