[V8] Run clang-tidy performance-for-range-copy check on src/

src/compilation-statistics.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 <ostream>  // NOLINT(readability/streams)
 #include <vector>
 
 #include "src/base/platform/platform.h"
 #include "src/compilation-statistics.h"
 
@@ skipping 116 matching lines @@
   }
 
   typedef std::vector<CompilationStatistics::PhaseMap::const_iterator>
       SortedPhases;
   SortedPhases sorted_phases(s.phase_map_.size());
   for (auto it = s.phase_map_.begin(); it != s.phase_map_.end(); ++it) {
     sorted_phases[it->second.insert_order_] = it;
   }
 
   if (!ps.machine_output) WriteHeader(os);
-  for (auto phase_kind_it : sorted_phase_kinds) {
+  for (const auto& phase_kind_it : sorted_phase_kinds) {
     const auto& phase_kind_name = phase_kind_it->first;
     if (!ps.machine_output) {
-      for (auto phase_it : sorted_phases) {
+      for (const auto& phase_it : sorted_phases) {
         const auto& phase_stats = phase_it->second;
         if (phase_stats.phase_kind_name_ != phase_kind_name) continue;
         const auto& phase_name = phase_it->first;
         WriteLine(os, ps.machine_output, phase_name.c_str(), phase_stats,
                   s.total_stats_);
       }
       WritePhaseKindBreak(os);
     }
     const auto& phase_kind_stats = phase_kind_it->second;
     WriteLine(os, ps.machine_output, phase_kind_name.c_str(), phase_kind_stats,
               s.total_stats_);
     os << std::endl;
   }
 
   if (!ps.machine_output) WriteFullLine(os);
   WriteLine(os, ps.machine_output, "totals", s.total_stats_, s.total_stats_);
 
   return os;
 }
 
 }  // namespace internal
 }  // namespace v8