[ic] Use UnseededNumberDictionary as a storage for names in TypeFeedbackMetadata.

src/objects.h

Index: src/objects.h
diff --git a/src/objects.h b/src/objects.h
index c52a17bef6192a1203d7d6acfc388ae03b538d34..eb5fc790900da0df9bf82541d656df6da55808a2 100644
--- a/src/objects.h
+++ b/src/objects.h
@@ -980,6 +980,7 @@ template <class C> inline bool Is(Object* obj);
   V(JSRegExp)                    \
   V(HashTable)                   \
   V(Dictionary)                  \
+  V(UnseededNumberDictionary)    \
   V(StringTable)                 \
   V(StringSet)                   \
   V(NormalizedMapCache)          \
@@ -1078,7 +1079,6 @@ class Object {
   INLINE(bool IsNameDictionary() const);
   INLINE(bool IsGlobalDictionary() const);
   INLINE(bool IsSeededNumberDictionary() const);
-  INLINE(bool IsUnseededNumberDictionary() const);
   INLINE(bool IsOrderedHashSet() const);
   INLINE(bool IsOrderedHashMap() const);
 
@@ -3124,6 +3124,7 @@ class BaseShape {
     DCHECK(UsesSeed);
     return HashForObject(key, object);
   }
+  static inline Map* GetMap(Isolate* isolate);
 };
 
 
@@ -3646,7 +3647,6 @@ class NumberDictionaryShape : public BaseDictionaryShape<uint32_t> {
  public:
   static inline bool IsMatch(uint32_t key, Object* other);
   static inline Handle<Object> AsHandle(Isolate* isolate, uint32_t key);
-  static const int kEntrySize = 3;
   static const bool kIsEnumerable = false;
 };
 
@@ -3655,6 +3655,7 @@ class SeededNumberDictionaryShape : public NumberDictionaryShape {
  public:
   static const bool UsesSeed = true;
   static const int kPrefixSize = 2;
+  static const int kEntrySize = 3;
 
   static inline uint32_t SeededHash(uint32_t key, uint32_t seed);
   static inline uint32_t SeededHashForObject(uint32_t key,
@@ -3666,9 +3667,24 @@ class SeededNumberDictionaryShape : public NumberDictionaryShape {
 class UnseededNumberDictionaryShape : public NumberDictionaryShape {
  public:
   static const int kPrefixSize = 0;
+  static const int kEntrySize = 2;
 
   static inline uint32_t Hash(uint32_t key);
   static inline uint32_t HashForObject(uint32_t key, Object* object);
+
+  template <typename Dictionary>
+  static inline PropertyDetails DetailsAt(Dictionary* dict, int entry) {
+    UNREACHABLE();
+    return PropertyDetails::Empty();
+  }
+
+  template <typename Dictionary>
+  static inline void DetailsAtPut(Dictionary* dict, int entry,
+                                  PropertyDetails value) {
+    UNREACHABLE();
+  }
+
+  static inline Map* GetMap(Isolate* isolate);
 };