Various cleanup #490

Job	Run time
nightly	5m 35s
loom	4m 20s
minrust	3m 39s
cross (i686-unknown-linux-gnu)	1m 40s
miri	10m 46s
cross (armv7-unknown-linux-gnueabihf)	1m 40s
rustfmt	6s
cross (powerpc-unknown-linux-gnu)	1m 57s
stable (ubuntu-latest)	2m 24s
cross (powerpc64-unknown-linux-gnu)	1m 46s
tsan	4m 10s
stable (macos-latest)	3m 17s
cross (wasm32-unknown-unknown)	20s
stable (windows-latest)	4m 35s
Publish Documentation	3m 32s
	49m 47s

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