Run tests under panic=abort #788

Job	Run time
nightly	55s
loom	19s
rustfmt	9s
cross (i686-unknown-linux-gnu)	30s
minrust	1m 2s
miri	12m 2s
cross (armv7-unknown-linux-gnueabihf)	30s
cross (powerpc-unknown-linux-gnu)	27s
panic=abort tests	15s
stable (ubuntu-latest)	1m 7s
cross (powerpc64-unknown-linux-gnu)	30s
tsan	1m 17s
stable (macos-latest)	1m 2s
cross (wasm32-unknown-unknown)	8s
stable (windows-latest)	3m 11s
Publish Documentation	13s
	23m 37s

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