target/loongarch: Implement xvbitclr xvbitset xvbitrev

This patch includes:
- XVBITCLR[I].{B/H/W/D};
- XVBITSET[I].{B/H/W/D};
- XVBITREV[I].{B/H/W/D}.

Signed-off-by: Song Gao <gaosong@loongson.cn>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20230914022645.1151356-45-gaosong@loongson.cn>