Add an efficient implementation based on critical-section #844

Job	Run time
clippy	14s
loom	41s
miri	3m 50s
fmt	10s
msrv	48s
security_audit	10s
test (stable)	1m 21s
test (beta)	1m 29s
test (nightly)	1m 23s
test (nightly, i686-unknown-linux-gnu)	1m 25s
	11m 31s

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