[turbofan] improve register allocator testing framework

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 1031 matching lines @@
     data->set_compilation_failed();
     return;
   }
   if (FLAG_turbo_reuse_spill_slots) {
     Run<ReuseSpillSlotsPhase>();
   }
   Run<CommitAssignmentPhase>();
   Run<PopulatePointerMapsPhase>();
   Run<ConnectRangesPhase>();
   Run<ResolveControlFlowPhase>();
-  Run<OptimizeMovesPhase>();
+  if (FLAG_turbo_move_optimization) {
+    Run<OptimizeMovesPhase>();
+  }
 
   if (FLAG_trace_turbo_graph) {
     OFStream os(stdout);
     PrintableInstructionSequence printable = {config, data->sequence()};
     os << "----- Instruction sequence after register allocation -----\n"
        << printable;
   }
 
   if (verifier != nullptr) {
     verifier->VerifyAssignment();
@@ skipping 12 matching lines @@
 }
 
 
 void Pipeline::TearDown() {
   InstructionOperand::TearDownCaches();
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8