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Add asm!-based backend for LoongArch64 targets #933

Job	Run time
test-msrv	3m 22s
minimal-versions / minimal-versions	3m 2s
set-msrv / set-msrv	6s
build (1.59, thumbv7em-none-eabi)	3m 28s
macos (1.59.0)	4m 27s
build (1.59, wasm32-unknown-unknown)	3m 27s
cross (1.59.0, aarch64-unknown-linux-gnu, default)	4m 22s
macos (stable)	1m 4s
linux (i686-unknown-linux-gnu, 1.59.0, sudo apt update && sudo apt install gcc-multilib)	6m 28s
cross (1.59.0, powerpc-unknown-linux-gnu, default)	3m 46s
build (stable, thumbv7em-none-eabi)	32s
cross (stable, aarch64-unknown-linux-gnu, default)	56s
build (stable, wasm32-unknown-unknown)	39s
linux (i686-unknown-linux-gnu, stable, sudo apt update && sudo apt install gcc-multilib)	3m 53s
cross (stable, powerpc-unknown-linux-gnu, default)	1m 4s
linux (x86_64-unknown-linux-gnu, 1.59.0)	5m 53s
windows (1.59.0, x86_64-pc-windows-gnu)	5m 59s
windows (stable, x86_64-pc-windows-gnu)	1m 52s
linux (x86_64-unknown-linux-gnu, stable)	2m 19s
cross (stable, aarch64-unknown-linux-gnu, asm)	1m 13s
	57m 52s

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