tcg/loongarch64: Lower basic tcg vec ops to LSX

LSX support on host cpu is detected via hwcap.

Lower the following ops to LSX:

- dup_vec
- dupi_vec
- dupm_vec
- ld_vec
- st_vec

Signed-off-by: Jia

tcg/loongarch64: Lower basic tcg vec ops to LSX

LSX support on host cpu is detected via hwcap.

Lower the following ops to LSX:

- dup_vec
- dupi_vec
- dupm_vec
- ld_vec
- st_vec

Signed-off-by: Jiajie Chen <c@jia.je>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20230908022302.180442-3-c@jia.je>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>

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