c reachables detection #150

Job	Run time
nodejs-testing-windows (17, 20.x)	2m 49s
nodejs-testing (ubuntu-latest, 17, 20.x)	6m 57s
nodejs-testing-windows (19, 20.x)	3m 1s
nodejs-testing-windows (20, 20.x)	2m 49s
nodejs-testing (ubuntu-latest, 19, 20.x)	3m 10s
nodejs-testing-windows (21, 20.x)	3m 1s
nodejs-testing (ubuntu-latest, 20, 20.x)	3m 0s
nodejs-testing (ubuntu-latest, 21, 20.x)	4m 32s
nodejs-testing (macos-latest, 17, 20.x)	4m 5s
nodejs-testing (macos-latest, 19, 20.x)	3m 49s
nodejs-testing (macos-latest, 20, 20.x)	4m 7s
nodejs-testing (macos-latest, 21, 20.x)	3m 49s
	45m 9s

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