cleanup #3510

Job	Run time
Ubuntu / Release / gcc	22m 49s
macOS / Release / homebrew-clang	7m 3s
Ubuntu / Debug / gcc	16m 33s
macOS / Debug / homebrew-clang	5m 15s
Ubuntu / Release / clang	18m 7s
macOS / Release / system-clang	5m 31s
Ubuntu / Debug / clang	13m 33s
macOS / Debug / system-clang	4m 23s
Windows / Release / cl	32m 48s
Windows / Release / clang	28m 41s
Windows / Release / clang-cl	31m 8s
Windows / Debug / cl	21m 4s
Windows / Debug / clang	16m 48s
Windows / Debug / clang-cl	26m 33s
	4h 10m 16s

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