re-order cond_swap and lookup #448

Job	Run time
Book tests	1m 23s
Bitrot check	1m 40s
Test on i686-unknown-linux-gnu	21m 8s
Test on ubuntu-latest	9m 59s
Test on i686-unknown-linux-gnu with beta features	21m 52s
Test on windows-latest	13m 25s
Test on i686-unknown-linux-gnu with nightly features	22m 38s
Build target wasm32-unknown-unknown	1m 46s
Test on macOS-latest	11m 30s
Build target wasm32-wasi	1m 31s
Intra-doc links	1m 21s
Rustfmt	14s
Test on ubuntu-latest with beta features	10m 23s
Test on windows-latest with beta features	14m 18s
Test on macOS-latest with beta features	8m 18s
Test on ubuntu-latest with nightly features	10m 40s
Test on windows-latest with nightly features	14m 29s
Test on macOS-latest with nightly features	8m 55s
	2h 55m 30s

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