Fix panic in BoundedBacktracker when max_haystack_len returns 0 #3388

Job	Run time
testfull-regex-syntax	1m 30s
miri-regex-automata	9m 9s
cross (s390x-unknown-linux-gnu)	2m 18s
cross (aarch64-unknown-linux-gnu)	2m 30s
testfull-regex-capi	1m 32s
testfull-regex	2m 44s
msrv	1m 29s
docsrs	1m 23s
test (nightly, ubuntu-latest, nightly)	2m 54s
test (stable, ubuntu-latest, stable)	3m 12s
cross (i686-unknown-linux-gnu)	2m 2s
testfull-regex-automata	8m 14s
cross (powerpc-unknown-linux-gnu)	2m 19s
cross (powerpc64-unknown-linux-gnu)	2m 10s
rustfmt	18s
test (win-gnu, windows-latest, stable-x86_64-gnu)	3m 40s
test (beta, ubuntu-latest, beta)	2m 10s
test (macos, macos-latest, stable)	2m 46s
test (win-msvc, windows-latest, stable)	6m 10s
	58m 30s

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