[vm/fuzzer] Advocate use of new collection features
[vm/fuzzer] Advocate use of new collection features

Rationale:
We should advocate use of spread and control flow collections
Change-Id: I5e6e86b7f0506e4b44c70105ff574058a5910ecf
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/114440
Reviewed-by: Felicitas Hetzelt <dd58ecf83e6dafb983e3eceed132b302900c5729@google.com>
Reviewed-by: Ben Konyi <67ffcaedcc3dc3d87dddb9627b72dd41756b31b1@google.com>
Commit-Queue: Aart Bik <293afa0533434225484ba3f9bf2859340baba6ea@google.com>

dartino/dart-sdk,dart-lang/sdk,dartino/dart-sdk,dart-lang/sdk,dart-archive/dart-sdk,dart-archive/dart-sdk,dart-archive/dart-sdk,dart-archive/dart-sdk,dartino/dart-sdk,dart-lang/sdk,dartino/dart-sdk,dart-lang/sdk,dartino/dart-sdk,dart-archive/dart-sdk,dart-lang/sdk,dart-lang/sdk,dartino/dart-sdk,dart-archive/dart-sdk,dart-archive/dart-sdk,dart-archive/dart-sdk,dartino/dart-sdk,dart-lang/sdk,dartino/dart-sdk,dart-lang/sdk,dart-archive/dart-sdk,dartino/dart-sdk