Keep two empty lines between declarations for cpp files

src/atomicops_internals_x86_gcc.cc

Index: src/atomicops_internals_x86_gcc.cc
===================================================================
--- src/atomicops_internals_x86_gcc.cc	(revision 15486)
+++ src/atomicops_internals_x86_gcc.cc	(working copy)
@@ -124,6 +124,7 @@
   }
 };
 
+
 // A global to get use initialized on startup via static initialization :/
 AtomicOpsx86Initializer g_initer;