[runtime] set AsyncFunctionNext/Throw to adapt arguments

src/bootstrapper.cc

Index: src/bootstrapper.cc
diff --git a/src/bootstrapper.cc b/src/bootstrapper.cc
index b96b834505c0ab62d528d74add2207a4d218e2e7..48639468c368bfa47ba94c1f0f7d334d4f7da2d8 100644
--- a/src/bootstrapper.cc
+++ b/src/bootstrapper.cc
@@ -2466,10 +2466,10 @@ void Bootstrapper::ExportFromRuntime(Isolate* isolate,
 
       Handle<JSFunction> async_function_next =
           SimpleInstallFunction(container, "AsyncFunctionNext",
-                                Builtins::kGeneratorPrototypeNext, 2, false);
+                                Builtins::kGeneratorPrototypeNext, 1, false);

[Dan Ehrenberg, 2016/05/18 18:58:02]

1 looks like the right value here, matching the other registration of this
builtin function; ditto Throw. Why was it 2 before?

[caitp (gmail), 2016/05/18 19:03:43]

The original implementation used a parameter for the generator object rather
than the receiver, I guess I never updated the formals count.

       Handle<JSFunction> async_function_throw =
           SimpleInstallFunction(container, "AsyncFunctionThrow",
-                                Builtins::kGeneratorPrototypeThrow, 2, false);
+                                Builtins::kGeneratorPrototypeThrow, 1, false);
       async_function_next->shared()->set_native(true);
       async_function_throw->shared()->set_native(true);
     }