Dart -> Engine roll stopped #120091
Description
On the Dart -> Engine roll reverted here flutter/engine#39422, Engine -> Framework rolls started failing with the error
14:50 +29 ~13 -1: test/integration.shard/stateless_stateful_hot_reload_test.dart: Can switch between stateless and stateful [E]
Exception: Hot reload request failed
[{"id":3,"result":{"code":1,"message":"Reloaded 1 of 652 libraries"}}]
Reassembling main.dart$main-3696557592808931 failed: ext.flutter.reassemble: (-32000) Server error
{"exception":"type '_State' is not a subtype of type 'State<StatefulWidget>?' of 'function result'","stack":"
#0 StatefulElement._state (package:flutter/src/widgets/framework.dart)\n
#1 StatefulElement.state (package:flutter/src/widgets/framework.dart:5071:38)\n
#2 StatefulElement.reassemble (package:flutter/src/widgets/framework.dart:5077:7)\n
#3 Element.reassemble.<anonymous closure> (package:flutter/src/widgets/framework.dart:3403:13)\n
#4 SingleChildRenderObjectElement.visitChildren
...
#389 BindingBase.reassembleApplication (package:flutter/src/foundation/binding.dart:595:12)\n
#390 BindingBase.registerSignalServiceExtension.<anonymous closure> (package:flutter/src/foundation/binding.dart:630:23)\n
#391 BindingBase.registerServiceExtension.<anonymous closure> (package:flutter/src/foundation/binding.dart:840:32)\n
<asynchronous suspension>\n","method":"ext.flutter.reassemble"}
test/integration.shard/test_driver.dart 751:5 FlutterRunTestDriver._throwErrorResponse
test/integration.shard/test_driver.dart 662:7 FlutterRunTestDriver._restart
===== asynchronous gap ===========================
test/integration.shard/stateless_stateful_hot_reload_test.dart 44:5 main.<fn>
To run this test again: /b/s/w/ir/x/w/flutter/bin/cache/dart-sdk/bin/dart test test/integration.shard/stateless_stateful_hot_reload_test.dart -p vm --plain-name 'Can switch between stateless and stateful'
Starting with the Engine -> Framework roll here #120030