Bytes::split_off - check fast path first (#693) #627

Job	Run time
loom	1m 39s
minrust	1m 48s
miri	10m 18s
cross (i686-unknown-linux-gnu)	50s
nightly	2m 49s
rustfmt	11s
cross (armv7-unknown-linux-gnueabihf)	34s
stable (ubuntu-latest)	1m 7s
cross (powerpc-unknown-linux-gnu)	32s
stable (macos-latest)	1m 10s
tsan	2m 5s
cross (powerpc64-unknown-linux-gnu)	32s
stable (windows-latest)	3m 8s
cross (wasm32-unknown-unknown)	14s
Publish Documentation	1m 31s
	28m 28s

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