[vm] Populate VM isolate group source data and instruction pointers.
[vm] Populate VM isolate group source data and instruction pointers.

Change-Id: I1fcdf4a58c4a9b6bd24b4b90fa7048031ec3af12
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/130702
Reviewed-by: Martin Kustermann <a35dd5b79fac84b2bb3b026a16b8becc55af5961@google.com>
Commit-Queue: Teagan Strickland <cce218d042444252b7ac446d60910fca7732559c@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