Keep two empty lines between declarations for cpp files

src/assembler.cc

Index: src/assembler.cc
===================================================================
--- src/assembler.cc	(revision 15486)
+++ src/assembler.cc	(working copy)
@@ -381,6 +381,7 @@
   }
 }
 
+
 void RelocInfoWriter::WriteExtraTaggedConstPoolData(int data) {
   WriteExtraTag(kConstPoolExtraTag, kConstPoolTag);
   for (int i = 0; i < kIntSize; i++) {
@@ -390,6 +391,7 @@
   }
 }
 
+
 void RelocInfoWriter::WriteExtraTaggedData(intptr_t data_delta, int top_tag) {
   WriteExtraTag(kDataJumpExtraTag, top_tag);
   for (int i = 0; i < kIntptrSize; i++) {
@@ -1322,6 +1324,7 @@
   return ExternalReference(Redirect(isolate, function));
 }
 
+
 ExternalReference ExternalReference::re_grow_stack(Isolate* isolate) {
   return ExternalReference(
       Redirect(isolate, FUNCTION_ADDR(NativeRegExpMacroAssembler::GrowStack)));
@@ -1334,6 +1337,7 @@
       FUNCTION_ADDR(NativeRegExpMacroAssembler::CaseInsensitiveCompareUC16)));
 }
 
+
 ExternalReference ExternalReference::re_word_character_map() {
   return ExternalReference(
       NativeRegExpMacroAssembler::word_character_map_address());