Keep two empty lines between declarations for cpp files

src/arm/simulator-arm.cc

Index: src/arm/simulator-arm.cc
===================================================================
--- src/arm/simulator-arm.cc	(revision 15486)
+++ src/arm/simulator-arm.cc	(working copy)
@@ -1026,6 +1026,7 @@
   registers_[12] = 0x50Bad4U;
 }
 
+
 // Some Operating Systems allow unaligned access on ARMv7 targets. We
 // assume that unaligned accesses are not allowed unless the v8 build system
 // defines the CAN_USE_UNALIGNED_ACCESSES macro to be non-zero.
@@ -1525,6 +1526,7 @@
   }
 }
 
+
 // Addressing Mode 4 - Load and Store Multiple
 void Simulator::HandleRList(Instruction* instr, bool load) {
   int rlist = instr->RlistValue();
@@ -1954,6 +1956,7 @@
     FixedDoubleArray::canonical_not_the_hole_nan_as_double() : value;
 }
 
+
 // Stop helper functions.
 bool Simulator::isStopInstruction(Instruction* instr) {
   return (instr->Bits(27, 24) == 0xF) && (instr->SvcValue() >= kStopCode);