[async-iteration] add support for for-await-of loops in Async Functions

src/runtime/runtime-internal.cc

Index: src/runtime/runtime-internal.cc
diff --git a/src/runtime/runtime-internal.cc b/src/runtime/runtime-internal.cc
index 229d25f15cd86eeec52768107677202057a0b24b..a1b8756036a3ad274f59f358d613ea943a4657f7 100644
--- a/src/runtime/runtime-internal.cc
+++ b/src/runtime/runtime-internal.cc
@@ -88,6 +88,13 @@ RUNTIME_FUNCTION(Runtime_ThrowStackOverflow) {
   return isolate->StackOverflow();
 }
 
+RUNTIME_FUNCTION(Runtime_ThrowSymbolAsyncIteratorInvalid) {
+  HandleScope scope(isolate);
+  DCHECK_EQ(0, args.length());
+  THROW_NEW_ERROR_RETURN_FAILURE(
+      isolate, NewTypeError(MessageTemplate::kSymbolAsyncIteratorInvalid));
+}
+
 RUNTIME_FUNCTION(Runtime_ThrowTypeError) {
   HandleScope scope(isolate);
   DCHECK_LE(1, args.length());
@@ -503,5 +510,12 @@ RUNTIME_FUNCTION(Runtime_AllowDynamicFunction) {
       Builtins::AllowDynamicFunction(isolate, target, global_proxy));
 }
 
+RUNTIME_FUNCTION(Runtime_CreateAsyncFromSyncIterator) {
+  // TODO(caitp): split AsyncFromSyncIterator functionality out of
+  //              https://codereview.chromium.org/2622833002
+  UNREACHABLE();
+  return isolate->heap()->undefined_value();
+}
+
 }  // namespace internal
 }  // namespace v8