target/arm: Have cpu_isar_feature() use a const ARMCPU object The @cpu_ variable is only accessed read-only, make it const. Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org> Reviewed-by: Richard Henderson <richard.henderson@linaro.org> Message-ID: <20260202222412.24923-3-philmd@linaro.org>