incorrect lazy stack traces in DWARF stack traces mode

[mraleph]

Future<T> run<T>(Future<T> Function() f) async {
  return await f();
}

Future<int> foo(String? x) =>
  run(() async {
    await Future.delayed(const Duration(milliseconds: 100));
    x!;
    return 0;
  });


void main(List<String> args) {
  foo(args.contains('null') ? null : 'args');
}

In symbolic mode we get:

Unhandled exception:
Null check operator used on a null value
#0      foo.<anonymous closure> (file:///tmp/test.dart:9)
<asynchronous suspension>
#1      run (file:///tmp/test.dart:3)
<asynchronous suspension>

But in DWARF mode we get (decoded):

Unhandled exception:
Null check operator used on a null value
*** *** *** *** *** *** *** *** *** *** *** *** *** *** *** ***
pid: 43972, tid: 8419924800, name Dart_Initialize
os: macos arch: arm64 comp: no sim: no
build_id: 'bda273a30039b5581b7890551a96ba43'
isolate_dso_base: 101268000, vm_dso_base: 101268000
isolate_instructions: 1012a1ac0, vm_instructions: 10129c000
#0      foo.<anonymous closure> (file:///tmp/test.dart:9:6)
<asynchronous suspension>
    #01 abs 0000000000000000 <invalid Dart instruction address>
<asynchronous suspension>

Furthermore with

Future<int> foo(String? x) async {
  await Future.delayed(const Duration(milliseconds: 100));
  x!;
  return 0;
}


void main(List<String> args) async {
  await foo(args.contains('null') ? null : 'args');
}

we get symbolic stack trace:

Unhandled exception:
Null check operator used on a null value
#0      foo (file:///tmp/test.dart:8)
<asynchronous suspension>
#1      main (file:///tmp/test.dart:14)
<asynchronous suspension>

But in DWARF async unwinder fails completely (we must be shaking away some important info)

Unhandled exception:
Null check operator used on a null value
*** *** *** *** *** *** *** *** *** *** *** *** *** *** *** ***
pid: 45486, tid: 8419924800, name Dart_Initialize
os: macos arch: arm64 comp: no sim: no
build_id: 'bda273a34a7ccf7e1b7890551aa6c861'
isolate_dso_base: 10510c000, vm_dso_base: 10510c000
isolate_instructions: 105145ac0, vm_instructions: 105140000
#0      foo (file:///tmp/test.dart:8:4)
#1      _SuspendState._createAsyncStarCallback.<anonymous closure> (dart:async-patch/async_patch.dart:379:7)
#2      _RootZone.runUnary (dart:async/zone.dart:1661:54)
#3      _FutureListener.handleValue (dart:async/future_impl.dart:147:18)
#4      Future._propagateToListeners.handleValueCallback (dart:async/future_impl.dart:784:45)
#5      Future._propagateToListeners (dart:async/future_impl.dart:813:13)
#6      Future._complete (dart:async/future_impl.dart:575:7)
#7      new Future.delayed.<anonymous closure> (dart:async/future.dart:424:16)
#8      Timer._createTimer.<anonymous closure> (dart:async-patch/timer_patch.dart:18:15)
#9      _Timer._runTimers (dart:isolate-patch/timer_impl.dart:398:19)
#10     _Timer._handleMessage (dart:isolate-patch/timer_impl.dart:429:5)
#11     _RawReceivePort._handleMessage (dart:isolate-patch/isolate_patch.dart:189:12)

/cc @aam @alexmarkov

[mraleph]

Related to customer issue b/279929839

[mraleph]

I started refactoring the code in the stack_trace.cc so tentatively assigning to myself.