crypto: optimize SubtleCrypto dispatch hot paths #5646

Job	Run time
Build slim tarball	2m 10s
x86_64-darwin: with shared libraries	29m 58s
aarch64-darwin: with shared libraries	17m 7s
x86_64-linux: with shared libraries	21m 36s
aarch64-linux: with shared libraries	18m 4s
	1h 28m 55s

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