[turbofan] Inline ReturnReceiver builtin into TurboFan.

src/compiler/js-call-reducer.cc

Index: src/compiler/js-call-reducer.cc
diff --git a/src/compiler/js-call-reducer.cc b/src/compiler/js-call-reducer.cc
index 5719a9230a4fd354994d6538ff24993ea3ce3e6e..475fd3f742a859b942d9573d9b0eadac0be410fd 100644
--- a/src/compiler/js-call-reducer.cc
+++ b/src/compiler/js-call-reducer.cc
@@ -745,6 +745,8 @@ Reduction JSCallReducer::ReduceJSCall(Node* node) {
           return ReduceReflectGetPrototypeOf(node);
         case Builtins::kArrayForEach:
           return ReduceArrayForEach(function, node);
+        case Builtins::kReturnReceiver:
+          return ReduceReturnReceiver(node);
         default:
           break;
       }
@@ -1002,6 +1004,13 @@ Reduction JSCallReducer::ReduceJSConstructWithSpread(Node* node) {
   return ReduceSpreadCall(node, arity);
 }
 
+Reduction JSCallReducer::ReduceReturnReceiver(Node* node) {
+  DCHECK_EQ(IrOpcode::kJSCall, node->opcode());
+  Node* receiver = NodeProperties::GetValueInput(node, 1);
+  ReplaceWithValue(node, receiver);
+  return Replace(receiver);
+}
+
 Graph* JSCallReducer::graph() const { return jsgraph()->graph(); }
 
 Isolate* JSCallReducer::isolate() const { return jsgraph()->isolate(); }