md5: Add inline-asm backend for LoongArch64 targets #936

Job	Run time
test-msrv	3m 19s
minimal-versions / minimal-versions	3m 8s
set-msrv / set-msrv	5s
windows (1.59.0, x86_64-pc-windows-gnu)	4m 35s
linux (i686-unknown-linux-gnu, 1.59.0, sudo apt update && sudo apt install gcc-multilib)	8m 28s
windows (stable, x86_64-pc-windows-gnu)	1m 35s
cross (1.59.0, aarch64-unknown-linux-gnu, default)	3m 47s
linux (i686-unknown-linux-gnu, stable, sudo apt update && sudo apt install gcc-multilib)	2m 48s
build (1.59, thumbv7em-none-eabi)	3m 23s
cross (1.59.0, powerpc-unknown-linux-gnu, default)	3m 41s
linux (x86_64-unknown-linux-gnu, 1.59.0)	6m 20s
build (1.59, wasm32-unknown-unknown)	3m 26s
cross (stable, aarch64-unknown-linux-gnu, default)	1m 2s
linux (x86_64-unknown-linux-gnu, stable)	2m 23s
build (stable, thumbv7em-none-eabi)	39s
cross (stable, powerpc-unknown-linux-gnu, default)	53s
macos (1.59.0)	4m 37s
build (stable, wasm32-unknown-unknown)	31s
cross (stable, aarch64-unknown-linux-gnu, asm)	58s
macos (stable)	53s
	56m 31s

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