allow starting DFA in noncontinuous bytes #1833

Job	Run time
test (stable, ubuntu-latest, stable)	8m 13s
test (stable-32, ubuntu-latest, stable, i686-unknown-linux-gnu)	4m 54s
test (stable-mips, ubuntu-latest, stable, mips64-unknown-linux-gnuabi64)	1m 41s
test (beta, ubuntu-latest, beta)	7m 11s
test (nightly, ubuntu-latest, nightly)	7m 25s
test (macos, macos-latest, stable)	7m 11s
test (win-msvc, windows-latest, stable)	12m 3s
test (win-gnu, windows-latest, stable-x86_64-gnu)	8m 12s
msrv	2m 53s
rustfmt	21s
miri-regex-automata	23m 35s
testfull-regex	6m 57s
testfull-regex-automata	14m 57s
testfull-regex-capi	44s
testfull-regex-syntax	3m 27s
	1h 49m 44s

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