flag_fuzzer managed to produce unexpected output

[derekxu16]

https://logs.chromium.org/logs/dart/buildbucket/cr-buildbucket/8728425132939576785/+/u/collect_shards/dartfuzz_-_flags_shard_34/task_stdout_stderr:_dartfuzz_-_flags_shard_34

=== FAILURE ===
command: out/ReleaseX64/dart pkg/vm/bin/gen_kernel.dart --platform=out/DebugX64C/vm_platform_strong.dill --aot --output=out/dartfuzz/0.dill pkg/compiler/lib/src/dart2js.dart
command: out/DebugX64C/gen_snapshot --use_compactor --inlining_caller_size_threshold=47189 --no_background_compilation --use_slow_path --snapshot_kind=app-aot-elf --elf=out/dartfuzz/0.elf out/dartfuzz/0.dill
command: out/DebugX64C/dartaotruntime --profiler --profile_vm=true --sample_buffer_duration=47 --compactor_tasks=1 out/dartfuzz/0.elf --invoker=test --platform-binaries=out/ReleaseX64 --out=out/dartfuzz/0.js --no-source-maps pkg/compiler/lib/src/util/memory_compiler.dart
command: diff out/dartfuzz/expected.js out/dartfuzz/0.js
exitCode: 1
stdout:
61052c61052
<       t1.exclusiveTicks = A._asIntQ(t2 == null ? -1 : t2);
---
>       A._asIntQ(t2 == null ? -1 : t2);
61831c61831
<       _.$function = _.resolvedUrl = _.exclusiveTicks = _.inclusiveTicks = _.kind = null;
---
>       _.$function = _.resolvedUrl = _.inclusiveTicks = _.kind = null;

[alexmarkov]

Cannot reproduce.