Introduce ProcessYoungWeakReferences and process weak list of allocation sites just during full GCs.

src/heap/mark-compact.cc

Index: src/heap/mark-compact.cc
diff --git a/src/heap/mark-compact.cc b/src/heap/mark-compact.cc
index fa127db6129c0f1598eb2140f3d1fdb294ff4e90..b5e8a1ec6b3996165314d5cc8ef01b444815ca13 100644
--- a/src/heap/mark-compact.cc
+++ b/src/heap/mark-compact.cc
@@ -2276,7 +2276,7 @@ void MarkCompactCollector::AfterMarking() {
 
   // Process the weak references.
   MarkCompactWeakObjectRetainer mark_compact_object_retainer;
-  heap()->ProcessWeakReferences(&mark_compact_object_retainer);
+  heap()->ProcessAllWeakReferences(&mark_compact_object_retainer);
 
   // Remove object groups after marking phase.
   heap()->isolate()->global_handles()->RemoveObjectGroups();
@@ -3546,7 +3546,7 @@ void MarkCompactCollector::EvacuateNewSpaceAndCandidates() {
       &UpdateReferenceInExternalStringTableEntry);
 
   EvacuationWeakObjectRetainer evacuation_object_retainer;
-  heap()->ProcessWeakReferences(&evacuation_object_retainer);
+  heap()->ProcessAllWeakReferences(&evacuation_object_retainer);
 
   // Visit invalidated code (we ignored all slots on it) and clear mark-bits
   // under it.