standalone/io/process_working_directory_test fails on arm64 with sanitizers

[alexmarkov]

standalone/io/process_working_directory_test test fails on the following bots:

vm-aot-asan-mac-release-arm64
vm-aot-tsan-mac-release-arm64
vm-aot-ubsan-mac-release-arm64
vm-asan-mac-release-arm64
vm-tsan-mac-release-arm64
vm-ubsan-mac-release-arm64

--- Command "vm" (took 01.000567s):
DART_CONFIGURATION=ReleaseASANARM64 xcodebuild/ReleaseASANARM64/dart -Dtest_runner.configuration=vm-asan-mac-release-arm64 --ignore-unrecognized-flags --packages=/Volumes/Work/s/wpxshhmxc/ir/.dart_tool/package_config.json /Volumes/Work/s/wpxshhmxc/ir/tests/standalone/io/process_working_directory_test.dart

exit code:
255

stderr:
Unhandled exception:
Expect.equals(expected: <99>, actual: <-6>) fails.
#0      Expect._fail (package:expect/expect.dart:891:5)
#1      Expect._failNotEqual (package:expect/expect.dart:174:5)
#2      Expect.equals (package:expect/expect.dart:157:5)
#3      ProcessWorkingDirectoryTest.testValidDirectory.<anonymous closure>.<anonymous closure> (file:///Volumes/Work/s/wpxshhmxc/ir/tests/standalone/io/process_working_directory_test.dart:35:20)
#4      Future._propagateToListeners.handleValueCallback (dart:async/future_impl.dart:948:45)
#5      Future._propagateToListeners (dart:async/future_impl.dart:977:13)
#6      Future._completeWithValue (dart:async/future_impl.dart:720:5)
#7      Future._asyncCompleteWithValue.<anonymous closure> (dart:async/future_impl.dart:804:7)
#8      _microtaskLoop (dart:async/schedule_microtask.dart:40:35)
#9      _startMicrotaskLoop (dart:async/schedule_microtask.dart:49:5)
#10     _runPendingImmediateCallback (dart:isolate-patch/isolate_patch.dart:127:13)
#11     _RawReceivePort._handleMessage (dart:isolate-patch/isolate_patch.dart:194:5)

--- Re-run this test:
python3 tools/test.py -n vm-asan-mac-release-arm64 standalone/io/process_working_directory_test