crypto: optimize SubtleCrypto dispatch hot paths #5504

Job	Run time
Build slim tarball	2m 12s
aarch64-linux: with shared libraries	19m 42s
x86_64-linux: with shared libraries	22m 36s
aarch64-darwin: with shared libraries	24m 28s
x86_64-darwin: with shared libraries	34m 49s
	1h 43m 47s

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