Keep two empty lines between declarations for cpp files

src/hydrogen-gvn.cc

 // Copyright 2013 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 105 matching lines @@
 };
 
 
 void TraceGVN(const char* msg, ...) {
   va_list arguments;
   va_start(arguments, msg);
   OS::VPrint(msg, arguments);
   va_end(arguments);
 }
 
+
 // Wrap TraceGVN in macros to avoid the expense of evaluating its arguments when
 // --trace-gvn is off.
 #define TRACE_GVN_1(msg, a1)                    \
   if (FLAG_trace_gvn) {                         \
     TraceGVN(msg, a1);                          \
   }
 
 #define TRACE_GVN_2(msg, a1, a2)                \
   if (FLAG_trace_gvn) {                         \
     TraceGVN(msg, a1, a2);                      \
@@ skipping 196 matching lines @@
 }
 
 
 HSideEffectMap& HSideEffectMap::operator= (const HSideEffectMap& other) {
   if (this != &other) {
     OS::MemCopy(data_, other.data_, kNumberOfTrackedSideEffects * kPointerSize);
   }
   return *this;
 }
 
+
 void HSideEffectMap::Kill(GVNFlagSet flags) {
   for (int i = 0; i < kNumberOfTrackedSideEffects; i++) {
     GVNFlag changes_flag = HValue::ChangesFlagFromInt(i);
     if (flags.Contains(changes_flag)) {
       if (data_[i] != NULL) count_--;
       data_[i] = NULL;
     }
   }
 }
 
@@ skipping 389 matching lines @@
 
   GvnBasicBlockState* previous_;
   GvnBasicBlockState* next_;
   HBasicBlock* block_;
   HValueMap* map_;
   HSideEffectMap dominators_;
   int dominated_index_;
   int length_;
 };
 
+
 // This is a recursive traversal of the dominator tree but it has been turned
 // into a loop to avoid stack overflows.
 // The logical "stack frames" of the recursion are kept in a list of
 // GvnBasicBlockState instances.
 void HGlobalValueNumberingPhase::AnalyzeGraph() {
   HBasicBlock* entry_block = graph()->entry_block();
   HValueMap* entry_map = new(zone()) HValueMap(zone());
   GvnBasicBlockState* current =
       GvnBasicBlockState::CreateEntry(zone(), entry_block, entry_map);
 
@@ skipping 84 matching lines @@
                                                       dominated);
         successor_map->Kill(side_effects_on_all_paths);
         successor_dominators->Kill(side_effects_on_all_paths);
       }
     }
     current = next;
   }
 }
 
 } }  // namespace v8::internal