Keep two empty lines between declarations for cpp files

test/cctest/test-macro-assembler-x64.cc

 // Copyright 2009 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 783 matching lines @@
   __ SmiAddConstant(r9, rcx, Smi::FromInt(second), exit);
   __ cmpq(r9, r8);
   __ j(not_equal, exit);
 
   __ incq(rax);
   __ SmiAddConstant(rcx, rcx, Smi::FromInt(second), exit);
   __ cmpq(rcx, r8);
   __ j(not_equal, exit);
 }
 
+
 TEST(SmiAdd) {
   v8::internal::V8::Initialize(NULL);
   // Allocate an executable page of memory.
   size_t actual_size;
   byte* buffer = static_cast<byte*>(OS::Allocate(Assembler::kMinimalBufferSize,
                                                  &actual_size,
                                                  true));
   CHECK(buffer);
   Isolate* isolate = Isolate::Current();
   HandleScope handles(isolate);
@@ skipping 576 matching lines @@
     index = masm->SmiToNegativeIndex(rcx, rcx, i);
     ASSERT(index.reg.is(rcx));
     __ shl(rcx, Immediate(index.scale));
     __ Set(r8, static_cast<intptr_t>(-x) << i);
     __ cmpq(rcx, r8);
     __ j(not_equal, exit);
     __ incq(rax);
   }
 }
 
+
 TEST(SmiIndex) {
   v8::internal::V8::Initialize(NULL);
   // Allocate an executable page of memory.
   size_t actual_size;
   byte* buffer =
       static_cast<byte*>(OS::Allocate(Assembler::kMinimalBufferSize * 3,
                                       &actual_size,
                                       true));
   CHECK(buffer);
   Isolate* isolate = Isolate::Current();
@@ skipping 1103 matching lines @@
   CodeDesc desc;
   masm->GetCode(&desc);
   // Call the function from C++.
   int result = FUNCTION_CAST<F0>(buffer)();
   CHECK_EQ(0, result);
 }
 
 
 
 #undef __