Run tests under panic=abort #783

Job	Run time
stable (ubuntu-latest)	1m 10s
stable (macos-latest)	1m 4s
stable (windows-latest)	2m 43s
nightly	55s
cross (i686-unknown-linux-gnu)	30s
minrust	1m 5s
cross (armv7-unknown-linux-gnueabihf)	26s
cross (powerpc-unknown-linux-gnu)	29s
rustfmt	20s
panic=abort tests	56s
cross (powerpc64-unknown-linux-gnu)	1m 17s
cross (wasm32-unknown-unknown)	15s
loom	21s
miri	12m 17s
tsan	1m 16s
Publish Documentation	40s
	25m 44s

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