VM: Re-format to use at most one newline between functions

runtime/vm/gc_sweeper.cc

Index: runtime/vm/gc_sweeper.cc
diff --git a/runtime/vm/gc_sweeper.cc b/runtime/vm/gc_sweeper.cc
index 2860292406e1481c093d37c17ecd086b1fc7d838..cb1d34a583160914ac65e84183199ae3e643244d 100644
--- a/runtime/vm/gc_sweeper.cc
+++ b/runtime/vm/gc_sweeper.cc
@@ -72,7 +72,6 @@ bool GCSweeper::SweepPage(HeapPage* page, FreeList* freelist, bool locked) {
   return in_use;
 }
 
-
 intptr_t GCSweeper::SweepLargePage(HeapPage* page) {
   intptr_t words_to_end = 0;
   RawObject* raw_obj = RawObject::FromAddr(page->object_start());
@@ -96,7 +95,6 @@ intptr_t GCSweeper::SweepLargePage(HeapPage* page) {
   return words_to_end;
 }
 
-
 class SweeperTask : public ThreadPool::Task {
  public:
   SweeperTask(Isolate* isolate,
@@ -168,7 +166,6 @@ class SweeperTask : public ThreadPool::Task {
   FreeList* freelist_;
 };
 
-
 void GCSweeper::SweepConcurrent(Isolate* isolate,
                                 HeapPage* first,
                                 HeapPage* last,