Run tests under panic=abort #778

Job	Run time
loom	25s
cross (i686-unknown-linux-gnu)	25s
miri	12m 28s
cross (armv7-unknown-linux-gnueabihf)	29s
minrust	59s
cross (powerpc-unknown-linux-gnu)	27s
nightly	1m 1s
cross (powerpc64-unknown-linux-gnu)	29s
panic=abort tests	24s
rustfmt	11s
cross (wasm32-unknown-unknown)	16s
stable (ubuntu-latest)	1m 16s
stable (macos-latest)	1m 40s
tsan	1m 57s
stable (windows-latest)	4m 48s
Publish Documentation	13s
	27m 28s

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