Failures on Add nonNulls and indexed extensions on iterables.

[lrhn]

There are new test failures on Add nonNulls and indexed extensions on iterables..

The tests

lib/mirrors/mirrors_reader_test Crash (expected Pass)
service/valid_source_locations_test/dds RuntimeError (expected Pass)
service/valid_source_locations_test/service RuntimeError (expected Pass)

are failing on configurations

vm-linux-debug-x64
vm-linux-release-x64

The mirrors_reader_test crashes hard with:

 exit code: -6
 stderr:  ../../runtime/lib/mirrors.cc: 567: error: unreachable code
 version=3.0.0-edge.a7f2562b389d0939865fdbb4854b927861b88356 (be) (Thu Mar 30 10:29:22 2023 +0000) on "linux_x64"
 pid=29185, thread=29249, isolate_group=main(0x5582fda44000), isolate=main(0x5582fda45800)
 os=linux, arch=x64, comp=no, sim=no
 isolate_instructions=5582fa904c20, vm_instructions=5582fa904c20
 fp=7fe89a2fbcb0, sp=7fe89a2fbb78, pc=5582fad11e4c
   pc 0x00005582fad11e4c fp 0x00007fe89a2fbcb0 dart::Profiler::DumpStackTrace(void*)+0x7c
   pc 0x00005582fa904e14 fp 0x00007fe89a2fbd90 dart::Assert::Fail(char const*, ...) const+0x84
   pc 0x00005582faac4e21 fp 0x00007fe89a2fbdd0 out/DebugX64/dart+0x243ae21
   pc 0x00005582fabee8f8 fp 0x00007fe89a2fc4f0 dart::NativeEntry::BootstrapNativeCallWrapper(_Dart_NativeArguments*, void (*)(_Dart_NativeArguments*))+0xc8
   pc 0x00007fe8a2403014 fp 0x00007fe89a2fc538 Unknown symbol

The source-location tests fail with

   Invalid argument(s): Unrecognized instance kind: RecordType
   package:observatory/src/service/object.dart 2796:3   stringToInstanceKind
   package:observatory/src/service/object.dart 2926:12  Instance._update
   package:observatory/src/service/object.dart 388:5    ServiceObject.updateFromServiceMap
   package:observatory/src/service/object.dart          ServiceObject._fromMap
   package:observatory/src/service/object.dart 1545:25  Isolate.getFromMap
   package:observatory/src/service/object.dart 4759:22  _upgradeMap.<fn>
   dart:collection-patch/compact_hash.dart 625:13       _LinkedHashMapMixin.forEach
   package:observatory/src/service/object.dart 4757:7   _upgradeMap
   package:observatory/src/service/object.dart 4750:5   _upgradeCollection
   package:observatory/src/service/object.dart 2923:5   Instance._update
   package:observatory/src/service/object.dart 388:5    ServiceObject.updateFromServiceMap
   package:observatory/src/service/object.dart          ServiceObject._fromMap
   package:observatory/src/service/object.dart 1545:25  Isolate.getFromMap
   package:observatory/src/service/object.dart 4759:22  _upgradeMap.<fn>
   dart:collection-patch/compact_hash.dart 625:13       _LinkedHashMapMixin.forEach
   package:observatory/src/service/object.dart 4757:7   _upgradeMap
   package:observatory/src/service/object.dart 4750:5   _upgradeCollection
   package:observatory/src/service/object.dart 3205:5   ServiceFunction._update
   package:observatory/src/service/object.dart 388:5    ServiceObject.updateFromServiceMap
   package:observatory/src/service/object.dart 347:11   ServiceObject.reload.<fn>
   dart:async/zone.dart 1407:47                         _rootRunUnary

Likely both are not ready to see a record type.
I'm preapproving the failures for now.