perf: avoid cloning HashBuilder input #152

Job	Run time
clippy	15s
feature-checks	53s
docs	15s
miri --no-default-features	4m 28s
miri	4m 25s
test stable --no-default-features	34s
miri --all-features	4m 44s
fmt	11s
test stable	24s
test stable --all-features	38s
test beta --no-default-features	28s
test beta	32s
test beta --all-features	48s
test nightly --no-default-features	27s
test nightly	29s
test nightly --all-features	44s
test 1.79 --no-default-features	21s
test 1.79	27s
test 1.79 --all-features	30s
	21m 33s

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