[vm/fuzzer] Decrease collection size
[vm/fuzzer] Decrease collection size

Rationale:
Control flow collections might contain multiple elements constructed
by loops. We should reduce the number of elements produced by each loop
to avoid creating too large collections.
Change-Id: Ib923b5a702fd246ff8a6d1a7f0926d7f791af610
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/118107
Commit-Queue: Felicitas Hetzelt <dd58ecf83e6dafb983e3eceed132b302900c5729@google.com>
Reviewed-by: Aart Bik <293afa0533434225484ba3f9bf2859340baba6ea@google.com>
Reviewed-by: Ben Konyi <67ffcaedcc3dc3d87dddb9627b72dd41756b31b1@google.com>

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