Revert "Modifies the debug garbage collector (CollectAllGarbage()) to correctly remove inter-genera…

runtime/vm/heap.cc

Index: runtime/vm/heap.cc
diff --git a/runtime/vm/heap.cc b/runtime/vm/heap.cc
index 0a73abf4adb1dac1eeb8773ac7f9c81aff5d75c1..975d0d55c27a38cdea105418f05c13953f0103a2 100644
--- a/runtime/vm/heap.cc
+++ b/runtime/vm/heap.cc
@@ -444,10 +444,7 @@ void Heap::CollectGarbage(Space space) {
 
 void Heap::CollectAllGarbage() {
   Thread* thread = Thread::Current();
-
-  // New space is evacuated so this GC will collect all dead objects
-  // kept alive by a cross-generational pointer.
-  new_space_.Evacuate();
+  CollectNewSpaceGarbage(thread, kInvokeApiCallbacks, kFull);
   CollectOldSpaceGarbage(thread, kInvokeApiCallbacks, kFull);
 }