message: Add helper to check if method is a native method
diff: @@ -1263,6 +1263,9 @@ class DexMethod:
  def is_abstract(self):
  return (self.encoded_method.access_flags & ACC_ABSTRACT) != 0
  + def is_native(self):
  + return (self.encoded_method.access_flags & ACC_NATIVE) != 0
  +
  def is_synthetic(self):
  return (self.encoded_method.access_flags & ACC_SYNTHETIC) != 0
  