[turbofan] remove hint aliasing

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 732 matching lines @@
           os_ << " \"stack:" << index << "\"";
         }
       }
     }
     int parent_index = -1;
     if (range->IsChild()) {
       parent_index = range->parent()->id();
     } else {
       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;
+    os_ << " " << parent_index;
     for (auto interval = range->first_interval(); interval != nullptr;
          interval = interval->next()) {
       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";
@@ skipping 60 matching lines @@
         os << "#" << SafeId(i) << ":" << SafeMnemonic(i);
       }
       os << ")" << std::endl;
     }
   }
   return os;
 }
 }
 }
 }  // namespace v8::internal::compiler