[turbofan] make LifetimePostion comparable

src/compiler/graph-visualizer.cc

 // Copyright 2013 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/graph-visualizer.h"
 
 #include <sstream>
 #include <string>
 
 #include "src/code-stubs.h"
@@ skipping 586 matching lines @@
     PrintIntProperty("loop_depth", current->loop_depth());
 
     const InstructionBlock* instruction_block =
         instructions->InstructionBlockAt(
             RpoNumber::FromInt(current->rpo_number()));
     if (instruction_block->code_start() >= 0) {
       int first_index = instruction_block->first_instruction_index();
       int last_index = instruction_block->last_instruction_index();
       PrintIntProperty(
           "first_lir_id",
-          LifetimePosition::GapFromInstructionIndex(first_index).Value());
+          LifetimePosition::GapFromInstructionIndex(first_index).value());
       PrintIntProperty("last_lir_id",
                        LifetimePosition::InstructionFromInstructionIndex(
-                           last_index).Value());
+                           last_index).value());
     }
 
     {
       Tag states_tag(this, "states");
       Tag locals_tag(this, "locals");
       int total = 0;
       for (BasicBlock::const_iterator i = current->begin(); i != current->end();
            ++i) {
         if ((*i)->opcode() == IrOpcode::kPhi) total++;
       }
@@ skipping 130 matching lines @@
       parent_index = range->id();
     }
     InstructionOperand* op = range->FirstHint();
     int hint_index = -1;
     if (op != NULL && op->IsUnallocated()) {
       hint_index = UnallocatedOperand::cast(op)->virtual_register();
     }
     os_ << " " << parent_index << " " << hint_index;
     for (auto interval = range->first_interval(); interval != nullptr;
          interval = interval->next()) {
-      os_ << " [" << interval->start().Value() << ", "
-          << interval->end().Value() << "[";
+      os_ << " [" << interval->start().value() << ", "
+          << interval->end().value() << "[";
     }
 
     UsePosition* current_pos = range->first_pos();
     while (current_pos != NULL) {
       if (current_pos->RegisterIsBeneficial() || FLAG_trace_all_uses) {
-        os_ << " " << current_pos->pos().Value() << " M";
+        os_ << " " << current_pos->pos().value() << " M";
       }
       current_pos = current_pos->next();
     }
 
     os_ << " \"\"\n";
   }
 }
 
 
 std::ostream& operator<<(std::ostream& os, const AsC1VCompilation& ac) {
@@ skipping 50 matching lines @@
         os << "#" << SafeId(i) << ":" << SafeMnemonic(i);
       }
       os << ")" << std::endl;
     }
   }
   return os;
 }
 }
 }
 }  // namespace v8::internal::compiler