[heap] Start sweeper tasks after evacuation.

src/heap/spaces.h

Index: src/heap/spaces.h
diff --git a/src/heap/spaces.h b/src/heap/spaces.h
index 5d22e4bc58ed80fcd4dedd45d60878cec9fd0aa8..a66f3394d3117585a1fd8af755b4cc54448464bb 100644
--- a/src/heap/spaces.h
+++ b/src/heap/spaces.h
@@ -413,6 +413,10 @@ class MemoryChunk {
     return concurrent_sweeping_;
   }
 
+  bool SweepingDone() {
+    return concurrent_sweeping_state().Value() == kSweepingDone;
+  }
+
   // Manage live byte count, i.e., count of bytes in black objects.
   inline void ResetLiveBytes();
   inline void IncrementLiveBytes(int by);
@@ -767,10 +771,6 @@ class Page : public MemoryChunk {
     DCHECK(SweepingDone());
   }
 
-  bool SweepingDone() {
-    return concurrent_sweeping_state().Value() == kSweepingDone;
-  }
-
   void ResetFreeListStatistics();
 
   size_t AvailableInFreeList();