Add better support for the LoongArch architecture #25

Job	Run time
unit-test (clang, -fno-omit-frame-pointer -fsanitize=undefined,address -ggdb3 -Og)	1m 9s
unit-test (gcc, -fno-omit-frame-pointer -fsanitize=undefined,address -ggdb3 -Og -fvar-tracking-as...	44s
	1m 53s

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