Add an efficient implementation based on critical-section #843

Job	Run time
msrv	49s
clippy	22s
test (stable)	1m 21s
fmt	8s
test (beta)	1m 29s
loom	43s
test (nightly)	1m 23s
miri	3m 56s
security_audit	7s
test (nightly, i686-unknown-linux-gnu)	1m 35s
	11m 53s

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