Python: Remove redundant IncludePostUpdateFlow and PhaseDependentFlow application.

Author: aschackmull

python/ql/lib/semmle/python/dataflow/new/internal/DataFlowPrivate.qll

@@ -474,7 +474,7 @@ import StepRelationTransformations
 predicate simpleLocalFlowStep(Node nodeFrom, Node nodeTo) {
   simpleLocalFlowStepForTypetracking(nodeFrom, nodeTo)
   or
-  summaryFlowSteps(nodeFrom, nodeTo)
+  summaryLocalStep(nodeFrom, nodeTo)
   or
   variableCaptureLocalFlowStep(nodeFrom, nodeTo)
 }
@@ -495,10 +495,6 @@ private predicate summaryLocalStep(Node nodeFrom, Node nodeTo) {
     nodeTo.(FlowSummaryNode).getSummaryNode(), true)
 }
 
-predicate summaryFlowSteps(Node nodeFrom, Node nodeTo) {
-  IncludePostUpdateFlow<PhaseDependentFlow<summaryLocalStep/2>::step/2>::step(nodeFrom, nodeTo)
-}
-
 predicate variableCaptureLocalFlowStep(Node nodeFrom, Node nodeTo) {
   // Blindly applying use-use flow can result in a node that steps to itself, for
   // example in while-loops. To uphold dataflow consistency checks, we don't want