queue: Implement {,Ref}UnwindSafe #2530

Job	Run time
codegen	26s
test (1.61, ubuntu-latest)	10m 55s
test (1.61, windows-latest)	14m 49s
test (stable, ubuntu-latest)	10m 3s
test (stable, windows-latest)	14m 29s
careful	5m 15s
clippy	19s
test (nightly, ubuntu-latest)	9m 44s
dependencies	17s
test (nightly, windows-latest)	13m 45s
features (1.61)	37s
test (nightly, ubuntu-latest, i686-unknown-linux-gnu)	10m 0s
loom	54s
features (nightly)	25s
miri	21m 10s
test (nightly, ubuntu-latest, armv7-unknown-linux-gnueabihf)	14m 16s
test (nightly, ubuntu-latest, armv5te-unknown-linux-gnueabi)	16m 16s
rustfmt	3s
san	13m 44s
docs	12s
shellcheck	9s
	2h 37m 48s

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