target/loongarch: Implement vreplve vpack vpick

This patch includes:
- VREPLVE[I].{B/H/W/D};
- VBSLL.V, VBSRL.V;
- VPACK{EV/OD}.{B/H/W/D};
- VPICK{EV/OD}.{B/H/W/D}.

Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Song Gao <gaosong@loongson.cn>
Message-Id: <20230504122810.4094787-40-gaosong@loongson.cn>
5 files changed