a31594b9af
* Fix possible race condition when flushing `stdout` and `stderr`. * Add help option and usage text (saves me from digging into the file when I forget a flag). * Avoid passing `enable-experiment` with an empty string. Change-Id: Iea288a1fad43f16c494510302efbcc65a2d91502 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/101744 Reviewed-by: Mark Zhou <markzipan@google.com> Reviewed-by: Vijay Menon <vsm@google.com> Commit-Queue: Nicholas Shahan <nshahan@google.com>