[turbofan] move Node to vreg mapping to InstructionSelector

src/compiler/instruction.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/common-operator.h"
 #include "src/compiler/generic-node-inl.h"
 #include "src/compiler/graph.h"
 #include "src/compiler/instruction.h"
 #include "src/macro-assembler.h"
 
@@ skipping 369 matching lines @@
   for (BasicBlockVector::const_iterator it = schedule->rpo_order()->begin();
        it != schedule->rpo_order()->end(); ++it, ++rpo_number) {
     DCHECK_EQ(NULL, (*blocks)[rpo_number]);
     DCHECK((*it)->GetRpoNumber().ToSize() == rpo_number);
     (*blocks)[rpo_number] = new (zone) InstructionBlock(zone, *it);
   }
 }
 
 
 InstructionSequence::InstructionSequence(Zone* instruction_zone,
-                                         const Graph* graph,
                                          const Schedule* schedule)
     : zone_(instruction_zone),
-      node_map_(graph->NodeCount(), kNodeUnmapped, zone()),
       instruction_blocks_(static_cast<int>(schedule->rpo_order()->size()), NULL,
                           zone()),
       constants_(ConstantMap::key_compare(),
                  ConstantMap::allocator_type(zone())),
       immediates_(zone()),
       instructions_(zone()),
       next_virtual_register_(0),
       pointer_maps_(zone()),
       doubles_(std::less<int>(), VirtualRegisterSet::allocator_type(zone())),
       references_(std::less<int>(), VirtualRegisterSet::allocator_type(zone())),
       deoptimization_entries_(zone()) {
   InitializeInstructionBlocks(zone(), schedule, &instruction_blocks_);
 }
 
 
-int InstructionSequence::GetVirtualRegister(const Node* node) {
-  if (node_map_[node->id()] == kNodeUnmapped) {
-    node_map_[node->id()] = NextVirtualRegister();
-  }
-  return node_map_[node->id()];
-}
-
-
 Label* InstructionSequence::GetLabel(BasicBlock::RpoNumber rpo) {
   return GetBlockStart(rpo)->label();
 }
 
 
 BlockStartInstruction* InstructionSequence::GetBlockStart(
     BasicBlock::RpoNumber rpo) {
   InstructionBlock* block = InstructionBlockAt(rpo);
   BlockStartInstruction* block_start =
       BlockStartInstruction::cast(InstructionAt(block->code_start()));
@@ skipping 228 matching lines @@
       os << " B" << succ_block->id();
     }
     os << "\n";
   }
   return os;
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8