get rid of is_list_comp boolean in favor of a direct check of ListComprehensionFlow

jedi/evaluate/iterable.py

@@ -497,3 +497,13 @@ def create_indexes_or_slices(evaluator, index_array):
         return (Slice(evaluator, start, stop, step),)
     else:
         return tuple(evaluator.process_precedence_element(prec))
+
+
+class ListComprehensionFlow(pr.ForFlow):
+    """Fake implementation to pretend being a ForFlow."""
+    def __init__(self, list_comprehension, input, parent):
+        lc = list_comprehension
+        sup = super(ListComprehensionFlow, self)
+        sup.__init__(helpers.FakeSubModule, [input], lc.parent.start_pos, lc.middle)
+        self.parent = parent or lc.get_parent_until(pr.IsScope)
+        self.list_comprehension = list_comprehension