md5: Add inline-asm backend for LoongArch64 targets #937

Job	Run time
test-msrv	4m 6s
minimal-versions / minimal-versions	3m 48s
set-msrv / set-msrv	2s
macos (1.59.0)	5m 33s
build (1.59, thumbv7em-none-eabi)	3m 23s
macos (stable)	59s
build (1.59, wasm32-unknown-unknown)	3m 31s
build (stable, thumbv7em-none-eabi)	33s
cross (1.59.0, aarch64-unknown-linux-gnu, default)	3m 49s
build (stable, wasm32-unknown-unknown)	31s
windows (1.59.0, x86_64-pc-windows-gnu)	8m 10s
cross (1.59.0, powerpc-unknown-linux-gnu, default)	3m 53s
linux (i686-unknown-linux-gnu, 1.59.0, sudo apt update && sudo apt install gcc-multilib)	6m 55s
windows (stable, x86_64-pc-windows-gnu)	5m 23s
cross (stable, aarch64-unknown-linux-gnu, default)	1m 1s
linux (i686-unknown-linux-gnu, stable, sudo apt update && sudo apt install gcc-multilib)	2m 31s
cross (stable, powerpc-unknown-linux-gnu, default)	52s
linux (x86_64-unknown-linux-gnu, 1.59.0)	6m 32s
cross (stable, aarch64-unknown-linux-gnu, asm)	1m 11s
linux (x86_64-unknown-linux-gnu, stable)	2m 33s
	1h 5m 16s

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