Add sanity check assert int class hierarchy

Change-Id: Iddcf2b64f745bb9385fb5b1621afa68056da89a8
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/103127
Reviewed-by: Kevin Millikin <kmillikin@google.com>
Commit-Queue: Jens Johansen <jensj@google.com>

https://dart.googlesource.com/sdk/+/7f67e83e3619468e5a574516fd06662ec2f7a5bd
diff --git a/commits.json b/commits.json
index 0012730..9f61bee 100644
--- a/commits.json
+++ b/commits.json
@@ -1,5 +1,5 @@
 {
   "external/github.com/flutter/engine":"301f560bd835e462134b491f1d5a74d21d03f3a8",
   "external/github.com/flutter/flutter":"d5aae54a28a2ba04f5737752edba9f5c98259c6c",
-  "sdk":"6b730e82039cbb963634a6054bbe9ac50ac7552f"
+  "sdk":"7f67e83e3619468e5a574516fd06662ec2f7a5bd"
 }
\ No newline at end of file