Keep two empty lines between declarations for cpp files

src/arm/disasm-arm.cc

Index: src/arm/disasm-arm.cc
===================================================================
--- src/arm/disasm-arm.cc	(revision 15486)
+++ src/arm/disasm-arm.cc	(working copy)
@@ -187,11 +187,13 @@
   Print(converter_.NameOfCPURegister(reg));
 }
 
+
 // Print the VFP S register name according to the active name converter.
 void Decoder::PrintSRegister(int reg) {
   Print(VFPRegisters::Name(reg, false));
 }
 
+
 // Print the VFP D register name according to the active name converter.
 void Decoder::PrintDRegister(int reg) {
   Print(VFPRegisters::Name(reg, true));