Stepping without using class vtables #802

Job	Run time
tests (ubuntu-latest, tests)	36s
build (ubuntu-latest, noradio)	2m 2s
tests (macos-latest, tests)	29s
build (ubuntu-latest, wifi)	2m 14s
tests (windows-latest, tests_nosan)	1m 13s
build (ubuntu-latest, bt)	2m 13s
build (macos-latest, noradio)	1m 28s
build (macos-latest, wifi)	1m 44s
build (macos-latest, bt)	1m 53s
build (windows-latest, noradio)	5m 30s
build (windows-latest, wifi)	4m 36s
build (windows-latest, bt)	4m 40s
	28m 38s

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