[dartfuzz] Fix flag_fuzzer_dart2js to work with the reduced build set.

Change-Id: I26a15e326dec7426ae97d640b2ad00f9372ffa88
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/508601
Reviewed-by: Alexander Aprelev <aam@google.com>
Commit-Queue: Ryan Macnak <rmacnak@google.com>

runtime/tools/dartfuzz/flag_fuzzer_dart2js.dart

@@ -9,6 +9,7 @@ import "flag_fuzzer.dart";
 
 Future<void> main() => flagFuzz(
   (String output) => [
+    "--no-dds",
     "pkg/compiler/lib/src/dart2js.dart",
     "--invoker=test",
     "--platform-binaries=out/ReleaseX64",