Merge pull request #2035 from JasonGross/movabs #981

Job	Run time
install (dev, Ubuntu, ubuntu-latest, 4.09.1)	38m 55s
install (dev, macOS, macos-latest, 4.14.2)	37m 30s
install (dev, Windows, windows-latest, 4.13.1, -async-proofs-j 1, git+https://github.com/ocaml/oc...	1h 31m 55s
install (8.20.0, Ubuntu, ubuntu-latest, 4.09.1)	39m 15s
install (8.20.0, macOS, macos-latest, 4.14.2)	33m 20s
install (8.20.0, Windows, windows-latest, 4.13.1, -async-proofs-j 1, git+https://github.com/ocaml...	1h 34m 11s
install (8.19.0, Ubuntu, ubuntu-latest, 4.09.1)	41m 23s
install (8.19.0, macOS, macos-latest, 4.14.2)	48m 51s
install (8.19.0, Windows, windows-latest, 4.13.1, -async-proofs-j 1, git+https://github.com/ocaml...	1h 35m 33s
install (8.18.0, Ubuntu, ubuntu-latest, 4.09.1)	42m 17s
install (8.18.0, macOS, macos-latest, 4.14.2)	37m 2s
install (8.18.0, Windows, windows-latest, 4.13.1, -async-proofs-j 1, git+https://github.com/ocaml...	1h 40m 13s
	11h 40m 25s

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