Stepping without using class vtables #821

Job	Run time
tests (ubuntu-latest, tests)	38s
build (ubuntu-latest, noradio)	2m 3s
tests (macos-latest, tests)	41s
build (ubuntu-latest, wifi)	2m 14s
tests (windows-latest, tests_nosan)	1m 33s
build (ubuntu-latest, bt)	2m 10s
build (macos-latest, noradio)	1m 33s
build (macos-latest, wifi)	1m 44s
build (macos-latest, bt)	1m 51s
build (windows-latest, noradio)	4m 49s
build (windows-latest, wifi)	5m 43s
build (windows-latest, bt)	4m 43s
	29m 42s

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