[api] Speed up template instantiation cache a bit.

src/objects.cc

Index: src/objects.cc
diff --git a/src/objects.cc b/src/objects.cc
index a49bc807f1707ece12e9087c4a1a5b9e71147e74..02f93fc04a98a1dce343df35f6f2b432fd046627 100644
--- a/src/objects.cc
+++ b/src/objects.cc
@@ -8023,7 +8023,10 @@ MaybeHandle<JSObject> JSObjectWalkVisitor<
         auto serial_number = handle(Smi::cast(data->serial_number()), isolate);
         CHECK(serial_number->value());
         auto cache = isolate->template_instantiations_cache();
-        Object* element = cache->Lookup(serial_number);
+        int entry =
+            cache->FindEntry(static_cast<uint32_t>(serial_number->value()));
+        CHECK(entry != UnseededNumberDictionary::kNotFound);
+        Object* element = cache->ValueAt(entry);
         CHECK_EQ(function, element);
 #endif
         return object;
@@ -17511,6 +17514,10 @@ template Handle<Object>
 Dictionary<SeededNumberDictionary, SeededNumberDictionaryShape,
            uint32_t>::DeleteProperty(Handle<SeededNumberDictionary>, int);
 
+template Handle<Object>
+Dictionary<UnseededNumberDictionary, UnseededNumberDictionaryShape,
+           uint32_t>::DeleteProperty(Handle<UnseededNumberDictionary>, int);
+
 template Handle<NameDictionary>
 HashTable<NameDictionary, NameDictionaryShape, Handle<Name> >::
     New(Isolate*, int, MinimumCapacity, PretenureFlag);
@@ -17523,6 +17530,10 @@ template Handle<SeededNumberDictionary>
 HashTable<SeededNumberDictionary, SeededNumberDictionaryShape, uint32_t>::
     Shrink(Handle<SeededNumberDictionary>, uint32_t);
 
+template Handle<UnseededNumberDictionary>
+    HashTable<UnseededNumberDictionary, UnseededNumberDictionaryShape,
+              uint32_t>::Shrink(Handle<UnseededNumberDictionary>, uint32_t);
+
 template Handle<NameDictionary>
 Dictionary<NameDictionary, NameDictionaryShape, Handle<Name> >::Add(
     Handle<NameDictionary>, Handle<Name>, Handle<Object>, PropertyDetails);