[vm] Add TODO about recognized kinds on DIFs.
[vm] Add TODO about recognized kinds on DIFs.

Bug: https://github.com/dart-lang/sdk/issues/37737
Change-Id: Ibe760ee0783c2853a52a19fa187fd152ade21661
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/111733
Reviewed-by: Martin Kustermann <a35dd5b79fac84b2bb3b026a16b8becc55af5961@google.com>
Commit-Queue: Teagan Strickland <cce218d042444252b7ac446d60910fca7732559c@google.com>

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