[vm] Add missing logical edges from instances to their class and from types to their type class.
[vm] Add missing logical edges from instances to their class and from types to their type class.

If all other edges to these objects are removed, v8_snapshot_profile_writer_test will complain they appear to be unreachable.

TEST=ci
Change-Id: I291fa285f5c0f9578fad574263d9311adf4c8818
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/245203
Commit-Queue: Ryan Macnak <d738b7f001baf9789095d7dc549cff6de60b011d@google.com>
Reviewed-by: Siva Annamalai <2e618a8cbd7bb6b3d4409061ae407d692a098546@google.com>

dart-lang/sdk,dart-lang/sdk,dart-lang/sdk,dart-lang/sdk,dart-lang/sdk,dart-lang/sdk,dart-lang/sdk,dart-lang/sdk