[vm/fuzzer] Reduce number of methods per class
[vm/fuzzer] Reduce number of methods per class

Rationale:
Reducing codesize to avoid timeouts on SIMARM builds.
Change-Id: I0f3ec773470ed2c60a9bc6f1c4ac65b7b4089a1e
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/118466
Commit-Queue: Felicitas Hetzelt <dd58ecf83e6dafb983e3eceed132b302900c5729@google.com>
Reviewed-by: Aart Bik <293afa0533434225484ba3f9bf2859340baba6ea@google.com>
Reviewed-by: Ben Konyi <67ffcaedcc3dc3d87dddb9627b72dd41756b31b1@google.com>

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