target/loongarch: Use actual operand size with vbsrl check

Hardcoded 32 bytes is used for vbsrl emulation check, there is
problem when options lsx=on,lasx=off is used for vbsrl.v instruction
in TCG mode. It injects LASX exception rather LSX exception.

Here actual operand size is used.

Cc: qemu-stable@nongnu.org
Fixes: df97f338076 ("target/loongarch: Implement xvreplve xvinsve0 xvpickve")
Signed-off-by: Bibo Mao <maobibo@loongson.cn>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>

target/loongarch/tcg/insn_trans/trans_vec.c.inc

@@ -5126,7 +5126,7 @@ static bool do_vbsrl_v(DisasContext *ctx, arg_vv_i *a, uint32_t oprsz)
 {
     int i, ofs;
 
-    if (!check_vec(ctx, 32)) {
+    if (!check_vec(ctx, oprsz)) {
         return true;
     }