The dart2/Isolate benchmark restricts the view of benchmark_harness
with a "show" clause. Removed it, and fixed the benchmark.
Change-Id: I99a4bdf00b88a3a69d8e6db1c0fa46dd85cc4aab
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/243264
Auto-Submit: William Hesse <whesse@google.com>
Reviewed-by: Jonas Termansen <sortie@google.com>
Commit-Queue: Jonas Termansen <sortie@google.com>
