[turbofan] break link between split use intervals

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 738 matching lines @@
       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;
-    UseInterval* cur_interval = range->first_interval();
-    while (cur_interval != NULL && range->Covers(cur_interval->start())) {
-      os_ << " [" << cur_interval->start().Value() << ", "
-          << cur_interval->end().Value() << "[";
-      cur_interval = cur_interval->next();
+    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";
       }
       current_pos = current_pos->next();
     }
 
@@ skipping 56 matching lines @@
         os << "#" << SafeId(i) << ":" << SafeMnemonic(i);
       }
       os << ")" << std::endl;
     }
   }
   return os;
 }
 }
 }
 }  // namespace v8::internal::compiler