Failures on [dart2js] Migrate more of entities.dart...[parser] Rename Token impl classes to avoid name conflicts

[alexmarkov]

There are new test failures on [dart2js] Migrate more of entities.dart...[parser] Rename Token impl classes to avoid name conflicts.

The tests

vm/dart_2/isolates/reload_many_isolates_live_and_die_test Timeout (expected Pass)

are failing on configurations

dartk-reload-linux-release-x64

This test seems to be very slow and has flaky timeouts on other configurations (dartk-linux-release-simarm, dartk-tsan-linux-release-x64, dartk-linux-release-simarm64, dartk-mac-release-x64, dartk-reload-rollback-linux-release-x64).

@mkustermann Is it possible to reduce the amount of work performed in this test without loosing test coverage? Or maybe we should SkipSlow the test on all these configurations?

[mkustermann]

For our artificial hot-reload test mode: The test itself launches subprocesses and performs reload on them. We don't need the test driver itself to run in this artificial identical hot reload mode.

For simulators: We can reduce the load.

For others: We should give it a little more time. e.g. the TSAN mode adds value (running it locally already revealed an issue: #48871)

-> cl/242107