Release evacuation candidates after parallel sweeper threads completed.

src/mark-compact.h

Index: src/mark-compact.h
diff --git a/src/mark-compact.h b/src/mark-compact.h
index 7a328576508f092c228e72f77534cd4b7ffe03ff..a58c849614e9957be8cd64186392aded17c401cd 100644
--- a/src/mark-compact.h
+++ b/src/mark-compact.h
@@ -595,6 +595,7 @@ class MarkCompactCollector {
     CONSERVATIVE,
     LAZY_CONSERVATIVE,
     PARALLEL_CONSERVATIVE,
+    CONCURRENT_CONSERVATIVE,
     PRECISE
   };
 
@@ -694,6 +695,8 @@ class MarkCompactCollector {
 
   bool IsConcurrentSweepingInProgress();
 
+  void FinalizeSweeping();
+
   // Parallel marking support.
   void MarkInParallel();
 
@@ -707,6 +710,8 @@ class MarkCompactCollector {
   void RemoveDeadInvalidatedCode();
   void ProcessInvalidatedCode(ObjectVisitor* visitor);
 
+  void ReleaseEvacuationCandidates();
+
   void StartSweeperThreads();
 
 #ifdef DEBUG