Remove unused 'receiver' field from generators

src/runtime/runtime-generator.cc

Index: src/runtime/runtime-generator.cc
diff --git a/src/runtime/runtime-generator.cc b/src/runtime/runtime-generator.cc
index 91766394522412a25939b16d4221287e22f52e73..c81895a177ea2ec6a35187e38f88523a4cad6453 100644
--- a/src/runtime/runtime-generator.cc
+++ b/src/runtime/runtime-generator.cc
@@ -14,9 +14,8 @@ namespace internal {
 
 RUNTIME_FUNCTION(Runtime_CreateJSGeneratorObject) {
   HandleScope scope(isolate);
-  DCHECK(args.length() == 2);
+  DCHECK(args.length() == 1);
   CONVERT_ARG_HANDLE_CHECKED(JSFunction, function, 0);
-  CONVERT_ARG_HANDLE_CHECKED(Object, receiver, 1);
   RUNTIME_ASSERT(function->shared()->is_generator());
 
   Handle<FixedArray> operand_stack;
@@ -32,7 +31,6 @@ RUNTIME_FUNCTION(Runtime_CreateJSGeneratorObject) {
       isolate->factory()->NewJSGeneratorObject(function);
   generator->set_function(*function);
   generator->set_context(isolate->context());
-  generator->set_receiver(*receiver);
   generator->set_operand_stack(*operand_stack);
   generator->set_continuation(JSGeneratorObject::kGeneratorExecuting);
   return *generator;
@@ -99,16 +97,6 @@ RUNTIME_FUNCTION(Runtime_GeneratorGetFunction) {
 }
 
 
-// Returns receiver of generator activation.
-RUNTIME_FUNCTION(Runtime_GeneratorGetReceiver) {
-  HandleScope scope(isolate);
-  DCHECK(args.length() == 1);
-  CONVERT_ARG_HANDLE_CHECKED(JSGeneratorObject, generator, 0);
-
-  return generator->receiver();
-}
-
-
 // Returns input of generator activation.
 RUNTIME_FUNCTION(Runtime_GeneratorGetInput) {
   HandleScope scope(isolate);