target/loongarch: Add avail_FP/FP_SP/FP_DP to check fpu instructions

Signed-off-by: Song Gao <gaosong@loongson.cn>
Acked-by: Richard Henderson <richard.henderson@linaro.org>
Message-ID: <20230822032724.1353391-12-gaosong@loongson.cn>
Message-Id: <20230822071959.35620-6-philmd@linaro.org>
7 files changed