target/loongarch: Add avail_LASX to check LASX instructions

Signed-off-by: Song Gao <gaosong@loongson.cn>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20230914022645.1151356-14-gaosong@loongson.cn>

target/loongarch/translate.h

@@ -23,6 +23,7 @@
 #define avail_LSPW(C)  (FIELD_EX32((C)->cpucfg2, CPUCFG2, LSPW))
 #define avail_LAM(C)   (FIELD_EX32((C)->cpucfg2, CPUCFG2, LAM))
 #define avail_LSX(C)   (FIELD_EX32((C)->cpucfg2, CPUCFG2, LSX))
+#define avail_LASX(C)  (FIELD_EX32((C)->cpucfg2, CPUCFG2, LASX))
 #define avail_IOCSR(C) (FIELD_EX32((C)->cpucfg1, CPUCFG1, IOCSR))
 
 /*