Stepping without using class vtables #786

Job	Run time
tests (ubuntu-latest, tests)	31s
build (ubuntu-latest, noradio)	2m 1s
tests (macos-latest, tests)	29s
build (ubuntu-latest, wifi)	2m 19s
tests (windows-latest, tests_nosan)	1m 28s
build (ubuntu-latest, bt)	2m 8s
build (macos-latest, noradio)	1m 28s
build (macos-latest, wifi)	1m 40s
build (macos-latest, bt)	1m 39s
build (windows-latest, noradio)	4m 37s
build (windows-latest, wifi)	4m 34s
build (windows-latest, bt)	5m 5s
	27m 59s

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