List copy benchmark
List copy benchmark

Change-Id: I25822ce9f2159ae801dc8c0953c1f9638b15d7f3
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/131261
Commit-Queue: Stephen Adams <60cb5b73b7e0cb7dcda53302da4fab6ecfc7fa8b@google.com>
Reviewed-by: Lasse R.H. Nielsen <80295e4ef244a07779f93eaa95d582bad8e316a5@google.com>

dart-lang/sdk,dart-lang/sdk,dart-lang/sdk,dart-lang/sdk,dart-lang/sdk,dart-lang/sdk,dart-lang/sdk,dart-lang/sdk