[ic] Support non-code handlers in megamorphic stub cache.

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"
 #include "src/messages.h"
@@ skipping 63 matching lines @@
            kind == Code::KEYED_LOAD_IC || kind == Code::CALL_IC ||
            kind == Code::STORE_IC || kind == Code::KEYED_STORE_IC;
   }
 
   // The ICs that don't pass slot and vector through the stack have to
   // save/restore them in the dispatcher.
   static bool ShouldPushPopSlotAndVector(Code::Kind kind);
 
   static InlineCacheState StateFromCode(Code* code);
 
+  static inline bool IsHandler(Object* object);
+
  protected:
   Address fp() const { return fp_; }
   Address pc() const { return *pc_address_; }
   Isolate* isolate() const { return isolate_; }
 
   // Get the shared function info of the caller.
   SharedFunctionInfo* GetSharedFunctionInfo() const;
   // Get the code object of the caller.
   Code* GetCode() const;
 
@@ skipping 408 matching lines @@
 
 // Helper for BinaryOpIC and CompareIC.
 enum InlinedSmiCheck { ENABLE_INLINED_SMI_CHECK, DISABLE_INLINED_SMI_CHECK };
 void PatchInlinedSmiCode(Isolate* isolate, Address address,
                          InlinedSmiCheck check);
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_IC_H_