Use acquire/release stores and loads when reading and writing the parallel sweeping state of a page.

src/spaces.h

Index: src/spaces.h
diff --git a/src/spaces.h b/src/spaces.h
index 05254d02437930ec745e548abff7415548b299bc..908e723827586d8af2bcfb3d798def1defab4539 100644
--- a/src/spaces.h
+++ b/src/spaces.h
@@ -484,18 +484,18 @@ class MemoryChunk {
 
   ParallelSweepingState parallel_sweeping() {
     return static_cast<ParallelSweepingState>(
-        NoBarrier_Load(&parallel_sweeping_));
+        Acquire_Load(&parallel_sweeping_));
   }
 
   void set_parallel_sweeping(ParallelSweepingState state) {
-    NoBarrier_Store(&parallel_sweeping_, state);
+    Release_Store(&parallel_sweeping_, state);
   }
 
   bool TryParallelSweeping() {
-    return NoBarrier_CompareAndSwap(&parallel_sweeping_,
-                                    PARALLEL_SWEEPING_PENDING,
-                                    PARALLEL_SWEEPING_IN_PROGRESS) ==
-                                        PARALLEL_SWEEPING_PENDING;
+    return Acquire_CompareAndSwap(&parallel_sweeping_,
+                                  PARALLEL_SWEEPING_PENDING,
+                                  PARALLEL_SWEEPING_IN_PROGRESS) ==
+                                      PARALLEL_SWEEPING_PENDING;
   }
 
   // Manage live byte count (count of bytes known to be live,