[turbofan] Split pure nodes in the scheduler if beneficial.

src/compiler/pipeline.cc

 // Copyright 2014 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/compiler/pipeline.h"
 
 #include <fstream>  // NOLINT(readability/streams)
 #include <sstream>
 
 #include "src/base/platform/elapsed-timer.h"
@@ skipping 530 matching lines @@
     graph_reducer.AddReducer(&select);
     graph_reducer.ReduceGraph();
   }
 };
 
 
 struct ComputeSchedulePhase {
   static const char* phase_name() { return "scheduling"; }
 
   void Run(PipelineData* data, Zone* temp_zone) {
-    Schedule* schedule = Scheduler::ComputeSchedule(temp_zone, data->graph());
+    Schedule* schedule = Scheduler::ComputeSchedule(
+        temp_zone, data->graph(), data->info()->is_splitting_enabled()
+                                      ? Scheduler::kSplitNodes
+                                      : Scheduler::kNoFlags);
     TraceSchedule(schedule);
     if (FLAG_turbo_verify) ScheduleVerifier::Run(schedule);
     data->set_schedule(schedule);
   }
 };
 
 
 struct InstructionSelectionPhase {
   static const char* phase_name() { return "select instructions"; }
 
@@ skipping 607 matching lines @@
 }
 
 
 void Pipeline::TearDown() {
   InstructionOperand::TearDownCaches();
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8