Rust

Support specializing get_hash without nightly #563

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Run time

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Job	Run time
nightly	2m 2s
Linux ARMv7	33s
build	2m 4s
Aarch64 Apple Darwin	2m 20s
Linux i686	1m 28s
no-std build	11s
wasm	11s
Linux x86_64	1m 31s
thumbv6m	12s
	10m 32s