AllocationSite objects weakly linked for traversal

src/objects-printer.cc

Index: src/objects-printer.cc
diff --git a/src/objects-printer.cc b/src/objects-printer.cc
index db324d0f10dac74b1c71e40ed6314b2754c3dc05..0ed737be4eeca5a82f05a8fe51242ed013ed4a20 100644
--- a/src/objects-printer.cc
+++ b/src/objects-printer.cc
@@ -1119,6 +1119,10 @@ void TypeSwitchInfo::TypeSwitchInfoPrint(FILE* out) {
 
 void AllocationSite::AllocationSitePrint(FILE* out) {
   HeapObject::PrintHeader(out, "AllocationSite");
+  PrintF(out, " - weak_next: ");
+  weak_next()->ShortPrint(out);
+  PrintF(out, "\n");
+
   PrintF(out, " - transition_info: ");
   if (transition_info()->IsCell()) {
     Cell* cell = Cell::cast(transition_info());