Apply transformations after comparing to golden files.

pkg/front_end/testcases/inference/downwards_inference_async_await.dart.strong.expect

 library test;
 import self as self;
 import "dart:async" as asy;
 import "dart:core" as core;
 
-static method main() → asy::Future<dynamic> /* originally async */ {
-  final asy::Completer<asy::FutureOr<dynamic>> :completer = asy::Completer::sync<asy::FutureOr<dynamic>>();
-  asy::FutureOr<dynamic> :return_value;
-  dynamic :async_op_then;
-  dynamic :async_op_error;
-  dynamic :await_jump_var = 0;
-  dynamic :await_ctx_var;
-  dynamic :saved_try_context_var0;
-  function :async_op([dynamic :result, dynamic :exception, dynamic :stack_trace]) → dynamic yielding 
-    try {
-      #L1:
-      {
-        dynamic d;
-        asy::_awaitHelper(<core::int>[d], :async_op_then, :async_op_error, :async_op);
-        [yield] null;
-        core::List<core::int> l0 = :result;
-        asy::_awaitHelper(asy::Future::value<core::List<core::int>>(<core::int>[d]), :async_op_then, :async_op_error, :async_op);
-        [yield] null;
-        core::List<core::int> l1 = :result;
-      }
-      :completer.complete(:return_value);
-      return;
-    }
-    on dynamic catch(dynamic :exception, dynamic :stack_trace) {
-      :completer.completeError(:exception, :stack_trace);
-    }
-  :async_op_then = asy::_asyncThenWrapperHelper(:async_op);
-  :async_op_error = asy::_asyncErrorWrapperHelper(:async_op);
-  asy::Future::microtask<dynamic>(:async_op);
-  return :completer.future;
+static method main() → asy::Future<dynamic> async {
+  dynamic d;
+  core::List<core::int> l0 = await<core::int>[d];
+  core::List<core::int> l1 = await asy::Future::value<core::List<core::int>>(<core::int>[d]);
 }