This patch adds a setjmp implementation for LoongArch. Signed-off-by: Zhou Yang <zhouyang@loongson.cn> Signed-off-by: Sun Haiyong <sunhaiyong@loongson.cn> Signed-off-by: Xiaotian Wu <wuxiaotian@loongson.cn> Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>