qemu/target_info: Add target_aarch64() helper

Add a helper to distinct whether the binary is targetting
Aarch64 or not.

Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Pierrick Bouvier <pierrick.bouvier@linaro.org>
Acked-by: Peter Maydell <peter.maydell@linaro.org>
Message-Id: <20251021210144.58108-2-philmd@linaro.org>

include/qemu/target-info.h

@@ -57,4 +57,11 @@ bool target_big_endian(void);
  */
 bool target_arm(void);
 
+/**
+ * target_aarch64:
+ *
+ * Returns whether the target architecture is Aarch64.
+ */
+bool target_aarch64(void);
+
 #endif