Keep two empty lines between declarations for cpp files

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

Index: test/cctest/test-macro-assembler-x64.cc
===================================================================
--- test/cctest/test-macro-assembler-x64.cc	(revision 15486)
+++ test/cctest/test-macro-assembler-x64.cc	(working copy)
@@ -801,6 +801,7 @@
   __ j(not_equal, exit);
 }
 
+
 TEST(SmiAdd) {
   v8::internal::V8::Initialize(NULL);
   // Allocate an executable page of memory.
@@ -1397,6 +1398,7 @@
   }
 }
 
+
 TEST(SmiIndex) {
   v8::internal::V8::Initialize(NULL);
   // Allocate an executable page of memory.