sha2: Add inline-asm backend for LoongArch64 targets #833

Job	Run time
simd	4m 17s
cross (1.51, aarch64-unknown-linux-gnu, default)	4m 41s
cross (1.51, powerpc-unknown-linux-gnu, default)	4m 30s
cross (stable, aarch64-unknown-linux-gnu, default)	59s
cross (stable, powerpc-unknown-linux-gnu, default)	54s
minimal-versions / minimal-versions	2m 49s
set-msrv / set-msrv	3s
test (1.41.0)	4m 4s
build (1.41.0, thumbv7em-none-eabi)	3m 50s
test (stable)	59s
build (1.41.0, wasm32-unknown-unknown)	4m 13s
build (stable, thumbv7em-none-eabi)	32s
build (stable, wasm32-unknown-unknown)	27s
	32m 18s

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