Remove unused 'receiver' field from generators

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 7250 matching lines @@
 
 
 class JSGeneratorObject: public JSObject {
  public:
   // [function]: The function corresponding to this generator object.
   DECL_ACCESSORS(function, JSFunction)
 
   // [context]: The context of the suspended computation.
   DECL_ACCESSORS(context, Context)
 
-  // [receiver]: The receiver of the suspended computation.
-  DECL_ACCESSORS(receiver, Object)
-
   // [input]: The most recent input value.
   DECL_ACCESSORS(input, Object)
 
   // [resume_mode]: The most recent resume mode.
   enum ResumeMode { kNext, kReturn, kThrow };
   DECL_INT_ACCESSORS(resume_mode)
 
   // [continuation]: Offset into code of continuation.
   //
   // A positive offset indicates a suspended generator.  The special
@@ skipping 13 matching lines @@
   // Dispatched behavior.
   DECLARE_VERIFIER(JSGeneratorObject)
 
   // Magic sentinel values for the continuation.
   static const int kGeneratorExecuting = -2;
   static const int kGeneratorClosed = -1;
 
   // Layout description.
   static const int kFunctionOffset = JSObject::kHeaderSize;
   static const int kContextOffset = kFunctionOffset + kPointerSize;
-  static const int kReceiverOffset = kContextOffset + kPointerSize;
-  static const int kInputOffset = kReceiverOffset + kPointerSize;
+  static const int kInputOffset = kContextOffset + kPointerSize;
   static const int kResumeModeOffset = kInputOffset + kPointerSize;
   static const int kContinuationOffset = kResumeModeOffset + kPointerSize;
   static const int kOperandStackOffset = kContinuationOffset + kPointerSize;
   static const int kSize = kOperandStackOffset + kPointerSize;
 
  private:
   DISALLOW_IMPLICIT_CONSTRUCTORS(JSGeneratorObject);
 };
 
 
@@ skipping 3414 matching lines @@
     }
     return value;
   }
 };
 
 
 }  // NOLINT, false-positive due to second-order macros.
 }  // NOLINT, false-positive due to second-order macros.
 
 #endif  // V8_OBJECTS_H_