fix crash on Android 5.0 API 21.

Author: zhangyiran

Legend/legendCore/src/main/java/com/lody/legend/art/ArtMethod.java

@@ -50,7 +50,8 @@ public static ArtMethod of(Method method) {
                     ? new ArtMethodStructV23_64Bit(method)
                     : new ArtMethodStructV23(method);
         }
-        else if (Build.VERSION.SDK_INT >= 21) {
+        // The artmethod struct of Android 5.0 equals to V19,so it should not use V22.
+        else if (Build.VERSION.SDK_INT > 21) {
             return Runtime.is64Bit()
                     ? new ArtMethodStructV22_64Bit(method)
                     : new ArtMethodStructV22(method);