loongarch: Fix sljit_emit_single and sljit_emit_op2cmpz #144

Job	Run time
build-test-on-arm32	3m 1s
build-test-on-armt2	3m 2s
build-test-on-loongarch64	2m 5s
build-test-on-aarch64	1m 45s
build-test-on-riscv32	3m 0s
build-test-on-riscv32-extensions	2m 15s
build-test-on-riscv64	2m 30s
build-test-on-riscv64-extensions	2m 14s
build-test-on-s390x	2m 48s
build-test-on-x64	17s
build-test-on-x86	25s
	23m 22s

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