Run tests under panic=abort #793

Job	Run time
loom	22s
minrust	1m 5s
miri	3h 52m 14s
cross (i686-unknown-linux-gnu)	28s
nightly	56s
cross (armv7-unknown-linux-gnueabihf)	31s
panic=abort tests	26s
rustfmt	6s
cross (powerpc-unknown-linux-gnu)	26s
cross (powerpc64-unknown-linux-gnu)	27s
tsan	1m 15s
cross (wasm32-unknown-unknown)	9s
stable (ubuntu-latest)	1m 10s
stable (macos-latest)	1m 35s
stable (windows-latest)	2m 49s
Publish Documentation	13s
	4h 4m 12s

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