[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 <sjindel@google.com>
diff --git a/tools/bots/flutter/analyze_flutter.sh b/tools/bots/flutter/analyze_flutter.sh
index 8b7df70..de71818 100755
--- a/tools/bots/flutter/analyze_flutter.sh
+++ b/tools/bots/flutter/analyze_flutter.sh
@@ -30,4 +30,4 @@
 
 bin/flutter update-packages
 
-$dart dev/bots/analyze.dart --dart-sdk $sdk
+$dart --enable-asserts dev/bots/analyze.dart --dart-sdk $sdk