Stepping without using class vtables #818

Job	Run time
build (ubuntu-latest, noradio)	1m 55s
tests (ubuntu-latest, tests)	33s
build (ubuntu-latest, wifi)	2m 23s
tests (macos-latest, tests)	31s
build (ubuntu-latest, bt)	2m 5s
tests (windows-latest, tests_nosan)	1m 27s
build (macos-latest, noradio)	1m 33s
build (macos-latest, wifi)	1m 45s
build (macos-latest, bt)	1m 44s
build (windows-latest, noradio)	3m 57s
build (windows-latest, wifi)	5m 6s
build (windows-latest, bt)	6m 31s
	29m 30s

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