Release evacuation candidates after parallel sweeper threads completed.

src/spaces.cc

Index: src/spaces.cc
diff --git a/src/spaces.cc b/src/spaces.cc
index 01e1e300875ff7af6ca5b63a4bad161caa709655..2bbaa1e88d23b3294a9d424c3d94420a15b4d9f4 100644
--- a/src/spaces.cc
+++ b/src/spaces.cc
@@ -2577,7 +2577,9 @@ bool PagedSpace::EnsureSweeperProgress(intptr_t size_in_bytes) {
   if (collector->AreSweeperThreadsActivated()) {
     if (FLAG_concurrent_sweeping) {
       if (collector->StealMemoryFromSweeperThreads(this) < size_in_bytes) {
-        collector->WaitUntilSweepingCompleted();
+        if (collector->WaitUntilSweepingCompleted()) {
+          collector->FinalizeSweeping();
+        }
         return true;
       }
       return false;