Minor optimization of Delimiters::from_byte to avoid an extra branch.… #335

Job	Run time
Linux (nightly)	2m 26s
Linux (nightly, --features dummy_match_byte)	2m 26s
Linux (beta)	38s
Linux (beta, --features dummy_match_byte)	35s
Linux (stable)	31s
Linux (stable, --features dummy_match_byte)	33s
Linux (1.63.0)	1m 10s
Linux (1.63.0, --features dummy_match_byte)	1m 9s
Linux (nightly, --features bench)	5m 43s
Linux (nightly, --features bench,dummy_match_byte)	5m 48s
Result	1s
	21m 0s

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