build

Make resuming a continuation more efficient #3570

Job	Run time
build (ubuntu-latest, 4.08, true, true, true)	2m 54s
build (ubuntu-latest, 4.09, true, true, true)	2m 54s
build (ubuntu-latest, 4.10, true, true, true)	3m 10s
build (ubuntu-latest, 4.11, true, true, true)	3m 8s
build (ubuntu-latest, 4.12, true, true, true)	3m 10s
build (ubuntu-latest, 4.13, true, true, true)	2m 56s
build (ubuntu-latest, 5.0, true, true, true)	4m 19s
build (ubuntu-latest, 5.1, true, true, true)	3m 27s
build (ubuntu-latest, 4.14, true, false, true)	3m 56s
build (ubuntu-latest, ocaml-variants.4.14.2+options,ocaml-option-32bit, true, false, true)	4m 31s
build (macos-latest, 4.14, true, false, true)	5m 55s
build (windows-latest, 4.14, true, false, true)	8m 37s
build (ubuntu-latest, 5.2, false, false, false)	11m 23s
build (ubuntu-latest, 5.1, false, false, true)	7m 5s
build (ubuntu-latest, ocaml-variants.5.2.0+options,ocaml-option-32bit, true, true, true)	8m 12s
build (macos-latest, 5.2, true, false, true)	9m 13s
build (windows-latest, 5.2, false, false, true)	20m 32s
	1h 45m 22s

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