Optimize the equality check case of ICCompare stubs.

src/heap.h

 // Copyright 2011 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 118 matching lines @@
   V(Map, oddball_map, OddballMap)                                              \
   V(Map, message_object_map, JSMessageObjectMap)                               \
   V(Map, foreign_map, ForeignMap)                                              \
   V(HeapNumber, nan_value, NanValue)                                           \
   V(HeapNumber, infinity_value, InfinityValue)                                 \
   V(HeapNumber, minus_zero_value, MinusZeroValue)                              \
   V(Map, neander_map, NeanderMap)                                              \
   V(JSObject, message_listeners, MessageListeners)                             \
   V(Foreign, prototype_accessors, PrototypeAccessors)                          \
   V(NumberDictionary, code_stubs, CodeStubs)                                   \
+  V(NumberDictionary, compare_stubs_known_objects, CompareStubsKnown)          \
   V(NumberDictionary, non_monomorphic_cache, NonMonomorphicCache)              \
   V(PolymorphicCodeCache, polymorphic_code_cache, PolymorphicCodeCache)        \
   V(Code, js_entry_code, JsEntryCode)                                          \
   V(Code, js_construct_entry_code, JsConstructEntryCode)                       \
   V(FixedArray, natives_source_cache, NativesSourceCache)                      \
   V(Object, last_script_id, LastScriptId)                                      \
   V(Script, empty_script, EmptyScript)                                         \
   V(Smi, real_stack_limit, RealStackLimit)                                     \
   V(StringDictionary, intrinsic_function_names, IntrinsicFunctionNames)        \
 
@@ skipping 971 matching lines @@
 
   // Finds out which space an object should get promoted to based on its type.
   inline OldSpace* TargetSpace(HeapObject* object);
   inline AllocationSpace TargetSpaceId(InstanceType type);
 
   // Sets the stub_cache_ (only used when expanding the dictionary).
   void public_set_code_stubs(NumberDictionary* value) {
     roots_[kCodeStubsRootIndex] = value;
   }
 
+  // Sets the compare_stubs_known_objects (only used when expanding
+  // the dictionary).
+  void public_set_compare_stubs_known_objects(NumberDictionary* value) {
+    roots_[kCompareStubsKnownRootIndex] = value;
+  }
+
   // Support for computing object sizes for old objects during GCs. Returns
   // a function that is guaranteed to be safe for computing object sizes in
   // the current GC phase.
   HeapObjectCallback GcSafeSizeOfOldObjectFunction() {
     return gc_safe_size_of_old_object_;
   }
 
   // Sets the non_monomorphic_cache_ (only used when expanding the dictionary).
   void public_set_non_monomorphic_cache(NumberDictionary* value) {
     roots_[kNonMonomorphicCacheRootIndex] = value;
@@ skipping 1389 matching lines @@
 
   DISALLOW_IMPLICIT_CONSTRUCTORS(PathTracer);
 };
 #endif  // DEBUG || LIVE_OBJECT_LIST
 
 } }  // namespace v8::internal
 
 #undef HEAP
 
 #endif  // V8_HEAP_H_