[runtime] Use Dictionary::Add in Dictionary::AtPut

Bug: 
Change-Id: Ib0090647de77510ce5f3bda67e45c7d7474ac779
Reviewed-on: https://chromium-review.googlesource.com/541337Reviewed-by: Camillo Bruni <cbruni@chromium.org>
Commit-Queue: Toon Verwaest <verwaest@chromium.org>
Cr-Commit-Position: refs/heads/master@{#46040}

src/objects.cc

@@ -17773,15 +17773,7 @@ Handle<Derived> Dictionary<Derived, Shape>::AtPut(Handle<Derived> dictionary,
     return dictionary;
   }
 
-  // Check whether the dictionary should be extended.
-  dictionary = EnsureCapacity(dictionary, 1);
-#ifdef DEBUG
-  USE(Shape::AsHandle(dictionary->GetIsolate(), key));
-#endif
-  PropertyDetails details = PropertyDetails::Empty();
-
-  AddEntry(dictionary, key, value, details, dictionary->Hash(key));
-  return dictionary;
+  return Add(dictionary, key, value, PropertyDetails::Empty());
 }
 
 template <typename Derived, typename Shape>
@@ -17794,6 +17786,10 @@ Handle<Derived> Dictionary<Derived, Shape>::Add(Handle<Derived> dictionary,
   // Check whether the dictionary should be extended.
   dictionary = EnsureCapacity(dictionary, 1);
 
+#ifdef DEBUG
+  USE(Shape::AsHandle(dictionary->GetIsolate(), key));
+#endif
+
   int entry = AddEntry(dictionary, key, value, details, dictionary->Hash(key));
   if (entry_out) *entry_out = entry;
   return dictionary;

src/objects/dictionary.h

@@ -63,8 +63,6 @@ class Dictionary : public HashTable<Derived, Shape> {
 
   int NumberOfEnumerableProperties();
 
-  enum SortMode { UNSORTED, SORTED };
-
   // Return the key indices sorted by its enumeration index.
   static Handle<FixedArray> IterationIndices(
       Handle<Dictionary<Derived, Shape>> dictionary);