[interpreter] Add ability to preserve bytecode.

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 <memory>
 
@@ skipping 6876 matching lines @@
   DECL_ACCESSORS(name, Object)
 
   // [code]: Function code.
   DECL_ACCESSORS(code, Code)
 
   // Get the abstract code associated with the function, which will either be
   // a Code object or a BytecodeArray.
   inline AbstractCode* abstract_code();
 
   inline void ReplaceCode(Code* code);
+  inline bool HasBaselineCode() const;
 
   // [optimized_code_map]: Map from native context to optimized code
   // and a shared literals array.
   DECL_ACCESSORS(optimized_code_map, FixedArray)
 
   // Returns entry from optimized code map for specified context and OSR entry.
   // Note that {code == nullptr, literals == nullptr} indicates no matching
   // entry has been found, whereas {code, literals == nullptr} indicates that
   // code is context-independent.
   CodeAndLiterals SearchOptimizedCodeMap(Context* native_context,
@@ skipping 66 matching lines @@
   DECL_ACCESSORS(scope_info, ScopeInfo)
 
   // [construct stub]: Code stub for constructing instances of this function.
   DECL_ACCESSORS(construct_stub, Code)
 
   // Sets the given code as the construct stub, and marks builtin code objects
   // as a construct stub.
   void SetConstructStub(Code* code);
 
   // Returns if this function has been compiled to native code yet.
-  inline bool is_compiled();
+  inline bool is_compiled() const;
 
   // [length]: The function length - usually the number of declared parameters.
   // Use up to 2^30 parameters.
   inline int length() const;
   inline void set_length(int value);
 
   // [internal formal parameter count]: The declared number of parameters.
   // For subclass constructors, also includes new.target.
   // The size of function's frame is internal_formal_parameter_count + 1.
   inline int internal_formal_parameter_count() const;
@@ skipping 4082 matching lines @@
     }
     return value;
   }
 };
 
 
 }  // NOLINT, false-positive due to second-order macros.
 }  // NOLINT, false-positive due to second-order macros.
 
 #endif  // V8_OBJECTS_H_