Stepping without using class vtables #780

Job	Run time
build (ubuntu-latest, noradio)	2m 2s
tests (ubuntu-latest, tests)	36s
build (ubuntu-latest, wifi)	2m 9s
tests (macos-latest, tests)	28s
build (ubuntu-latest, bt)	2m 1s
tests (windows-latest, tests_nosan)	1m 21s
build (macos-latest, noradio)	1m 33s
build (macos-latest, wifi)	1m 55s
build (macos-latest, bt)	1m 57s
build (windows-latest, noradio)	4m 43s
build (windows-latest, wifi)	5m 40s
build (windows-latest, bt)	4m 46s
	29m 11s

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