Wait for sweeper threads in EnsureSweeperProgress() only if the main thread finished its sweeping p…

src/spaces.cc

Index: src/spaces.cc
diff --git a/src/spaces.cc b/src/spaces.cc
index 0af587d2052263e6168b65cb1573ceb5a99203c4..1861c5340391d50db9d7c2ac3e51ce6dd6f2d0da 100644
--- a/src/spaces.cc
+++ b/src/spaces.cc
@@ -2553,9 +2553,11 @@ bool PagedSpace::EnsureSweeperProgress(intptr_t size_in_bytes) {
   if (collector->AreSweeperThreadsActivated()) {
     if (collector->IsConcurrentSweepingInProgress()) {
       if (collector->StealMemoryFromSweeperThreads(this) < size_in_bytes) {
-        collector->WaitUntilSweepingCompleted();
-        collector->FinalizeSweeping();
-        return true;
+        if (!collector->sequential_sweeping()) {
+          collector->WaitUntilSweepingCompleted();
+          collector->FinalizeSweeping();
+          return true;
+        }
       }
       return false;
     }