target/loongarch: Fix the vinsgr2vr/vpickve2gr instructions cause system coredump

The vinsgr2vr/vpickve2gr instructions need use get_src/get_dst to get
gpr registers value, not cpu_gpr[]. The $zero register does not
have cpu_gpr[0] allocated.

Resolves: https://gitlab.com/qemu-project/qemu/-/issues/1662

Signed-off-by: Song Gao <gaosong@loongson.cn>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20230525120005.2223413-1-gaosong@loongson.cn>
1 file changed