target/loongarch: Implement xvinsgr2vr xvpickve2gr

This patch includes:
- XVINSGR2VR.{W/D};
- XVPICKVE2GR.{W/D}[U].

Signed-off-by: Song Gao <gaosong@loongson.cn>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20230914022645.1151356-52-gaosong@loongson.cn>
4 files changed