Remove unused 'receiver' field from generators

src/objects.h

Index: src/objects.h
diff --git a/src/objects.h b/src/objects.h
index 6ce1c997a6e8ab46f8696cda19200e82e9683c16..f4ed526bab2672142d260de635a18c2f93a5b1c7 100644
--- a/src/objects.h
+++ b/src/objects.h
@@ -7268,9 +7268,6 @@ class JSGeneratorObject: public JSObject {
   // [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)
 
@@ -7304,8 +7301,7 @@ class JSGeneratorObject: public JSObject {
   // 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;