Add arch support for LoongArch64 #136

Job	Run time
test (i686-unknown-linux-gnu)	1m 22s
test (x86_64-unknown-linux-gnu)	22s
test (aarch64-unknown-linux-gnu)	1m 34s
test (riscv64gc-unknown-linux-gnu)	46s
test (loongarch64-unknown-linux-gnu)	48s
test (riscv32gc-unknown-linux-gnu)	1m 37s
	6m 29s

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