Keep two empty lines between declarations for cpp files

src/mips/code-stubs-mips.cc

Index: src/mips/code-stubs-mips.cc
===================================================================
--- src/mips/code-stubs-mips.cc	(revision 15486)
+++ src/mips/code-stubs-mips.cc	(working copy)
@@ -6815,6 +6815,7 @@
   GenerateMiss(masm);
 }
 
+
 void ICCompareStub::GenerateMiss(MacroAssembler* masm) {
   {
     // Call the runtime system in a fresh internal frame.
@@ -7145,6 +7146,7 @@
   RememberedSetAction action;
 };
 
+
 #define REG(Name) { kRegister_ ## Name ## _Code }
 
 static const AheadOfTimeWriteBarrierStubList kAheadOfTime[] = {