Keep two empty lines between declarations for cpp files

src/mips/lithium-codegen-mips.cc

Index: src/mips/lithium-codegen-mips.cc
===================================================================
--- src/mips/lithium-codegen-mips.cc	(revision 15486)
+++ src/mips/lithium-codegen-mips.cc	(working copy)
@@ -3360,6 +3360,7 @@
   __ bind(&receiver_ok);
 }
 
+
 void LCodeGen::DoApplyArguments(LApplyArguments* instr) {
   Register receiver = ToRegister(instr->receiver());
   Register function = ToRegister(instr->function());
@@ -3886,6 +3887,7 @@
   __ sub_d(f0, f12, f14);
 }
 
+
 void LCodeGen::DoDeferredRandom(LRandom* instr) {
   __ PrepareCallCFunction(1, scratch0());
   __ CallCFunction(ExternalReference::random_uint32_function(isolate()), 1);