[vm] Small fixes

Some small fixes split off from
https://dart-review.googlesource.com/c/sdk/+/246241.

* Print code comments on disassembly if the code object exists.
* Add Struct to the NativeType API.
* Fix typo.
* Add documentation.

TEST=Only cosmetic changes, build/run CI should be enough.

Change-Id: Ie193243573b034c52e41401b4d384d556c212fdd
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/250165
Commit-Queue: Daco Harkes <dacoharkes@google.com>
Reviewed-by: Aske Simon Christensen <askesc@google.com>

https://dart.googlesource.com/sdk/+/c48f6fea580178bd34f2d872588dcc1c79bdb01c
diff --git a/commits.json b/commits.json
index 3a3d676..9df1024 100644
--- a/commits.json
+++ b/commits.json
@@ -1,5 +1,5 @@
 {
   "external/github.com/flutter/engine":"e78ed7f1c9735d5e6af759c31d0f9ad82f849c4d",
   "external/github.com/flutter/flutter":"66c9d44bc0164638b39b828502d24b76a4909f0a",
-  "sdk":"ecba15b64164d271dbb0734c19610faf645f866c"
+  "sdk":"c48f6fea580178bd34f2d872588dcc1c79bdb01c"
 }
\ No newline at end of file