[interpreter] Make setting of function data more resilient.

src/objects.h

 // Copyright 2015 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_OBJECTS_H_
 #define V8_OBJECTS_H_
 
 #include <iosfwd>
 
 #include "src/assert-scope.h"
@@ skipping 6710 matching lines @@
   //  - a FunctionTemplateInfo to make benefit the API [IsApiFunction()].
   //  - a Smi identifying a builtin function [HasBuiltinFunctionId()].
   //  - a BytecodeArray for the interpreter [HasBytecodeArray()].
   // In the long run we don't want all functions to have this field but
   // we can fix that when we have a better model for storing hidden data
   // on objects.
   DECL_ACCESSORS(function_data, Object)
 
   inline bool IsApiFunction();
   inline FunctionTemplateInfo* get_api_func_data();
+  inline void set_api_func_data(FunctionTemplateInfo* data);
   inline bool HasBuiltinFunctionId();
   inline BuiltinFunctionId builtin_function_id();
+  inline void set_builtin_function_id(BuiltinFunctionId id);
   inline bool HasBytecodeArray();
   inline BytecodeArray* bytecode_array();
+  inline void set_bytecode_array(BytecodeArray* bytecode);
+  inline void ClearBytecodeArray();
 
   // [script info]: Script from which the function originates.
   DECL_ACCESSORS(script, Object)
 
   // [num_literals]: Number of literals used by this function.
   inline int num_literals() const;
   inline void set_num_literals(int value);
 
   // [start_position_and_type]: Field used to store both the source code
   // position, whether or not the function is a function expression,
@@ skipping 4088 matching lines @@
     }
     return value;
   }
 };
 
 
 }  // NOLINT, false-positive due to second-order macros.
 }  // NOLINT, false-positive due to second-order macros.
 
 #endif  // V8_OBJECTS_H_