[cleanup] Remove instanceof cache.

src/heap/heap.h

Index: src/heap/heap.h
diff --git a/src/heap/heap.h b/src/heap/heap.h
index aaddcb9a5d6fefcb6829b5eca3c0f248e9495848..92d0f45e9e505e8a0c5b9d95944fe17d1d2626ed 100644
--- a/src/heap/heap.h
+++ b/src/heap/heap.h
@@ -189,9 +189,6 @@ using v8::MemoryPressureLevel;
   V(FixedArray, single_character_string_cache, SingleCharacterStringCache)     \
   V(FixedArray, string_split_cache, StringSplitCache)                          \
   V(FixedArray, regexp_multiple_cache, RegExpMultipleCache)                    \
-  V(Object, instanceof_cache_function, InstanceofCacheFunction)                \
-  V(Object, instanceof_cache_map, InstanceofCacheMap)                          \
-  V(Object, instanceof_cache_answer, InstanceofCacheAnswer)                    \
   /* Lists and dictionaries */                                                 \
   V(NameDictionary, empty_properties_dictionary, EmptyPropertiesDictionary)    \
   V(NameDictionary, public_symbol_table, PublicSymbolTable)                    \
@@ -739,9 +736,6 @@ class Heap {
   inline Address* OldSpaceAllocationTopAddress();
   inline Address* OldSpaceAllocationLimitAddress();
 
-  // Clear the Instanceof cache (used when a prototype changes).
-  inline void ClearInstanceofCache();
-
   // FreeSpace objects have a null map after deserialization. Update the map.
   void RepairFreeListsAfterDeserialization();
 
@@ -871,10 +865,6 @@ class Heap {
 
   void IncrementDeferredCount(v8::Isolate::UseCounterFeature feature);
 
-  // Completely clear the Instanceof cache (to stop it keeping objects alive
-  // around a GC).
-  inline void CompletelyClearInstanceofCache();
-
   inline uint32_t HashSeed();
 
   inline int NextScriptId();