[turbofan] Also run the CheckpointElimination as part of load elimination.

src/compiler/pipeline.cc

Index: src/compiler/pipeline.cc
diff --git a/src/compiler/pipeline.cc b/src/compiler/pipeline.cc
index b410c3a47a49a8e023f531ccfe7bb79903c580a9..585923fa69d36c63e016846be502018fea6b65be 100644
--- a/src/compiler/pipeline.cc
+++ b/src/compiler/pipeline.cc
@@ -1141,6 +1141,7 @@ struct LoadEliminationPhase {
     RedundancyElimination redundancy_elimination(&graph_reducer, temp_zone);
     LoadElimination load_elimination(&graph_reducer, data->jsgraph(),
                                      temp_zone);
+    CheckpointElimination checkpoint_elimination(&graph_reducer);
     ValueNumberingReducer value_numbering(temp_zone, data->graph()->zone());
     CommonOperatorReducer common_reducer(&graph_reducer, data->graph(),
                                          data->common(), data->machine());
@@ -1148,6 +1149,7 @@ struct LoadEliminationPhase {
     AddReducer(data, &graph_reducer, &dead_code_elimination);
     AddReducer(data, &graph_reducer, &redundancy_elimination);
     AddReducer(data, &graph_reducer, &load_elimination);
+    AddReducer(data, &graph_reducer, &checkpoint_elimination);
     AddReducer(data, &graph_reducer, &common_reducer);
     AddReducer(data, &graph_reducer, &value_numbering);
     graph_reducer.ReduceGraph();