[ic] Cache weak cells containing prototypes in respective PrototypeInfo objects.

src/objects-printer.cc

Index: src/objects-printer.cc
diff --git a/src/objects-printer.cc b/src/objects-printer.cc
index dcba244d172bfcaf3aedce10ef3de65ffd609b2d..2105c1ccfd380377a33aa491ad12359c945bf6f8 100644
--- a/src/objects-printer.cc
+++ b/src/objects-printer.cc
@@ -1202,6 +1202,7 @@ void JSModuleNamespace::JSModuleNamespacePrint(std::ostream& os) {  // NOLINT
 
 void PrototypeInfo::PrototypeInfoPrint(std::ostream& os) {  // NOLINT
   HeapObject::PrintHeader(os, "PrototypeInfo");
+  os << "\n - weak cell: " << Brief(weak_cell());
   os << "\n - prototype users: " << Brief(prototype_users());
   os << "\n - registry slot: " << registry_slot();
   os << "\n - validity cell: " << Brief(validity_cell());