[turbofan] Machine operators are globally shared singletons.

src/compiler/raw-machine-assembler.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 "src/compiler/raw-machine-assembler.h"
 #include "src/compiler/scheduler.h"
 
 namespace v8 {
 namespace internal {
 namespace compiler {
 
 RawMachineAssembler::RawMachineAssembler(Graph* graph,
                                          MachineSignature* machine_sig,
                                          MachineType word)
     : GraphBuilder(graph),
       schedule_(new (zone()) Schedule(zone())),
-      machine_(zone(), word),
+      machine_(word),
       common_(zone()),
       machine_sig_(machine_sig),
       call_descriptor_(
           Linkage::GetSimplifiedCDescriptor(graph->zone(), machine_sig)),
       parameters_(NULL),
       exit_label_(schedule()->end()),
       current_block_(schedule()->start()) {
   int param_count = static_cast<int>(parameter_count());
   Node* s = graph->NewNode(common_.Start(param_count));
   graph->SetStart(s);
@@ skipping 127 matching lines @@
   Node* node = graph()->NewNode(op, input_count, inputs);
   BasicBlock* block = op->opcode() == IrOpcode::kParameter ? schedule()->start()
                                                            : CurrentBlock();
   schedule()->AddNode(block, node);
   return node;
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8