[runtime] No need to carry around the creation context for JSBoundFunctions.

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/allocation.h"
@@ skipping 7226 matching lines @@
   DECL_ACCESSORS(bound_target_function, JSReceiver)
 
   // [bound_this]: The value that is always passed as the this value when
   // calling the wrapped function.
   DECL_ACCESSORS(bound_this, Object)
 
   // [bound_arguments]: A list of values whose elements are used as the first
   // arguments to any call to the wrapped function.
   DECL_ACCESSORS(bound_arguments, FixedArray)
 
-  // [creation_context]: The native context in which the function was bound.
-  // TODO(bmeurer, verwaest): Can we (mis)use (unused) constructor field in
-  // the Map instead of putting this into the object? Only required for
-  // JSReceiver::GetCreationContext() anyway.
-  DECL_ACCESSORS(creation_context, Context)
-
   static MaybeHandle<Context> GetFunctionRealm(
       Handle<JSBoundFunction> function);
 
   DECLARE_CAST(JSBoundFunction)
 
   // Dispatched behavior.
   DECLARE_PRINTER(JSBoundFunction)
   DECLARE_VERIFIER(JSBoundFunction)
 
   // The bound function's string representation implemented according
   // to ES6 section 19.2.3.5 Function.prototype.toString ( ).
   static Handle<String> ToString(Handle<JSBoundFunction> function);
 
   // Layout description.
   static const int kBoundTargetFunctionOffset = JSObject::kHeaderSize;
   static const int kBoundThisOffset = kBoundTargetFunctionOffset + kPointerSize;
   static const int kBoundArgumentsOffset = kBoundThisOffset + kPointerSize;
-  static const int kCreationContextOffset =
-      kBoundArgumentsOffset + kPointerSize;
-  static const int kLengthOffset = kCreationContextOffset + kPointerSize;
+  static const int kLengthOffset = kBoundArgumentsOffset + kPointerSize;
   static const int kNameOffset = kLengthOffset + kPointerSize;
   static const int kSize = kNameOffset + kPointerSize;
 
   // Indices of in-object properties.
   static const int kLengthIndex = 0;
   static const int kNameIndex = 1;
 
  private:
   DISALLOW_IMPLICIT_CONSTRUCTORS(JSBoundFunction);
 };
@@ skipping 3467 matching lines @@
     }
     return value;
   }
 };
 
 
 }  // NOLINT, false-positive due to second-order macros.
 }  // NOLINT, false-positive due to second-order macros.
 
 #endif  // V8_OBJECTS_H_