Add better support for the LoongArch architecture #27

Job	Run time
unit-test (clang, -fno-omit-frame-pointer -fsanitize=undefined,address -ggdb3 -Og)	58s
unit-test (gcc, -fno-omit-frame-pointer -fsanitize=undefined,address -ggdb3 -Og -fvar-tracking-as...	50s
	1m 48s

Provide feedback