Remove custom weak handling of monomorphic IC.

src/ic/ic.h

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef V8_IC_H_
 #define V8_IC_H_
 
 #include "src/ic/ic-state.h"
 #include "src/macro-assembler.h"
 
@@ skipping 58 matching lines @@
   // Compute the current IC state based on the target stub, receiver and name.
   void UpdateState(Handle<Object> receiver, Handle<Object> name);
 
   bool IsNameCompatibleWithPrototypeFailure(Handle<Object> name);
   void MarkPrototypeFailure(Handle<Object> name) {
     DCHECK(IsNameCompatibleWithPrototypeFailure(name));
     old_state_ = state_;
     state_ = PROTOTYPE_FAILURE;
   }
 
-  // If the stub contains weak maps then this function adds the stub to
-  // the dependent code array of each weak map.
-  static void RegisterWeakMapDependency(Handle<Code> stub);
-
-  // This function is called when a weak map in the stub is dying,
-  // invalidates the stub by setting maps in it to undefined.
-  static void InvalidateMaps(Code* stub);
-
   // Clear the inline cache to initial state.
   static void Clear(Isolate* isolate, Address address,
                     ConstantPoolArray* constant_pool);
 
 #ifdef DEBUG
   bool IsLoadStub() const {
     return target()->is_load_stub() || target()->is_keyed_load_stub();
   }
 
   bool IsStoreStub() const {
@@ skipping 677 matching lines @@
 
 // Support functions for interceptor handlers.
 DECLARE_RUNTIME_FUNCTION(LoadPropertyWithInterceptorOnly);
 DECLARE_RUNTIME_FUNCTION(LoadPropertyWithInterceptor);
 DECLARE_RUNTIME_FUNCTION(LoadElementWithInterceptor);
 DECLARE_RUNTIME_FUNCTION(StorePropertyWithInterceptor);
 }
 }  // namespace v8::internal
 
 #endif  // V8_IC_H_