gdb/python: add Type.is_scalar property

Add a new read-only property which is True for scalar types,
otherwise, it's False.

gdb/python/py-type.c

@@ -433,6 +433,19 @@ typy_get_objfile (PyObject *self, void *closure)
   return objfile_to_objfile_object (objfile).release ();
 }
 
+/* Return true if this is a scalar type, otherwise, returns false.  */
+
+static PyObject *
+typy_is_scalar (PyObject *self, void *closure)
+{
+  struct type *type = ((type_object *) self)->type;
+
+  if (is_scalar_type (type))
+    Py_RETURN_TRUE;
+  else
+    Py_RETURN_FALSE;
+}
+
 /* Return the type, stripped of typedefs. */
 static PyObject *
 typy_strip_typedefs (PyObject *self, PyObject *args)
@@ -1487,6 +1500,8 @@ static gdb_PyGetSetDef type_object_getset[] =
     "The tag name for this type, or None.", NULL },
   { "objfile", typy_get_objfile, NULL,
     "The objfile this type was defined in, or None.", NULL },
+  { "is_scalar", typy_is_scalar, nullptr,
+    "Is this a scalar type?", nullptr },
   { NULL }
 };