General cleanup #4614

Job	Run time
Check	8s
Runtimes	32s
Compiler (ubuntu, node current)	3m 17s
Coverage	3m 33s
Bootstrap (debug)	8m 31s
Compiler (ubuntu, node lts/*)	2m 44s
Bootstrap (release)	10m 25s
Features	39s
Loader	27s
Compiler (macos, node current)	2m 35s
Compiler (macos, node lts/*)	3m 24s
Compiler (windows, node current)	4m 45s
Compiler (windows, node lts/*)	2m 21s
	43m 21s

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