[vm] Pass --enable-asserts to analyze.dart in analyze_flutter.sh.
[vm] Pass --enable-asserts to analyze.dart in analyze_flutter.sh.

Change-Id: Iafc519c1f3a991bba7cd3bb82a73836d78984b0e
Reviewed-on: https://dart-review.googlesource.com/c/93082
Reviewed-by: Samir Jindel <5720a19f3a84f5405fa0776737a4149175e41e6a@google.com>

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