Make incremental marker post-process JSWeakCollection.

src/heap.cc

Index: src/heap.cc
diff --git a/src/heap.cc b/src/heap.cc
index 24e1d53881dcd2319b596fc34b8212aff0a06898..cf5bdbcc89e0a527af2d5a448a5cfa9d7c769527 100644
--- a/src/heap.cc
+++ b/src/heap.cc
@@ -1920,11 +1920,7 @@ class ScavengingVisitor : public StaticVisitorBase {
                     &ObjectEvacuationStrategy<POINTER_OBJECT>::
                         template VisitSpecialized<SharedFunctionInfo::kSize>);
 
-    table_.Register(kVisitJSWeakMap,
-                    &ObjectEvacuationStrategy<POINTER_OBJECT>::
-                    Visit);
-
-    table_.Register(kVisitJSWeakSet,
+    table_.Register(kVisitJSWeakCollection,
                     &ObjectEvacuationStrategy<POINTER_OBJECT>::
                     Visit);