Failures on [vm] Identify the vm isolate etc by construction not by name.

[alexmarkov]

There are new test failures on [vm] Identify the vm isolate etc by construction not by name..

The tests

standalone/io/namespace_test RuntimeError (expected Pass)

are failing on configurations

vm-appjit-linux-product-x64

Log:

--- Command "app_jit" (took 02.000933s):
DART_CONFIGURATION=ProductX64 out/ProductX64/dart --snapshot=/b/s/w/ir/out/ProductX64/generated_compilations/vm-appjit-linux-product-x64/tests_standalone_io_namespace_test/out.jitsnapshot --snapshot-kind=app-jit --sound-null-safety -Dtest_runner.configuration=vm-appjit-linux-product-x64 --ignore-unrecognized-flags --packages=/b/s/w/ir/.dart_tool/package_config.json /b/s/w/ir/tests/standalone/io/namespace_test.dart

exit code:
255

stdout:
stdout:

stderr:
Error: Error when reading 'b/s/w/ir/.dart_tool/package_config.json': No such file or directory
b/s/w/ir/tests/standalone/io/namespace_test.dart: Error: Error when reading 'b/s/w/ir/tests/standalone/io/namespace_test.dart': No such file or directory

stderr:
Unhandled exception:
Expect.equals(expected: <0>, actual: <254>) fails.
#0      Expect._fail (package:expect/expect.dart:698:5)
#1      Expect.equals (package:expect/expect.dart:122:5)
#2      setupTest (file:///b/s/w/ir/tests/standalone/io/namespace_test.dart:206:12)
#3      main (file:///b/s/w/ir/tests/standalone/io/namespace_test.dart:220:5)
#4      _delayEntrypointInvocation.<anonymous closure> (dart:isolate-patch/isolate_patch.dart:295:33)
#5      _RawReceivePort._handleMessage (dart:isolate-patch/isolate_patch.dart:184:12)

--- Re-run this test:
python3 tools/test.py -n vm-appjit-linux-product-x64 standalone/io/namespace_test

/cc @rmacnak-google

[alexmarkov]

Confirmed that test fails on 48cbd9b but passes on the parent commit 0ae2ac1.