Stepping without using class vtables #816

Job	Run time
tests (ubuntu-latest, tests)	29s
tests (macos-latest, tests)	30s
tests (windows-latest, tests_nosan)	1m 24s
build (ubuntu-latest, noradio)	1m 54s
build (ubuntu-latest, wifi)	2m 20s
build (ubuntu-latest, bt)	2m 5s
build (macos-latest, noradio)	1m 31s
build (macos-latest, wifi)	1m 42s
build (macos-latest, bt)	1m 32s
build (windows-latest, noradio)	4m 12s
build (windows-latest, wifi)	4m 32s
build (windows-latest, bt)	4m 44s
	26m 55s

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