[vm/gardening/ffi] There are multiple libraries named ''

[mkustermann]

There's new failures on an old test, see log

--- Command "vm" (took 983ms):
set DART_CONFIGURATION=ReleaseARM64 & set DART_SUPPRESS_WER=1 & set DART_CRASHPAD_HANDLER=c:\opt\s\w\ir\cache\builder\sdk\out\ReleaseARM64\crashpad_handler.exe & out\ReleaseARM64\dart.exe --sound-null-safety -Dtest_runner.configuration=vm-win-release-arm64 --ignore-unrecognized-flags --packages=C:\opt\s\w\ir\cache\builder\sdk\.dart_tool\package_config.json C:\opt\s\w\ir\cache\builder\sdk\tests\lib\mirrors\bad_argument_types_test.dart

exit code:
255

stdout:
1
0

stderr:
Unhandled exception:
Exception: There are multiple libraries named '': [vm:ffi:native-assets, file:///C:/opt/s/w/ir/cache/builder/sdk/tests/lib/mirrors/bad_argument_types_test.dart]
#0      MirrorSystem.findLibrary (dart:mirrors-patch/mirrors_patch.dart:69:7)
#1      badLibrarySetterInvoke (file:///C:/opt/s/w/ir/cache/builder/sdk/tests/lib/mirrors/bad_argument_types_test.dart:143:36)
#2      main (file:///C:/opt/s/w/ir/cache/builder/sdk/tests/lib/mirrors/bad_argument_types_test.dart:160:3)
#3      _delayEntrypointInvocation.<anonymous closure> (dart:isolate-patch/isolate_patch.dart:314:19)
#4      _RawReceivePort._handleMessage (dart:isolate-patch/isolate_patch.dart:193:12)

--- Re-run this test:
python3 tools/test.py -n vm-win-release-arm64 lib/mirrors/bad_argument_types_test

This may have to do with us enabling native assets by default now, which may put the vm:ffi:native-assets library in always which then causes this multiple libraries named '' error.

@dcharkes Could you have a look?

[alexmarkov]

This test appears to be meta-flaking, flipping between Pass and RuntimeError.
https://dart-ci.firebaseapp.com/#showLatestFailures=false&test=lib/mirrors/bad_argument_types_test