[CFE/kernel] Dummy TreeNodes can leak - null parent pointer in test As kernel `TreeNode`s have `parent`-pointers we can leak through our dummy nodes. This CL makes a list of all TreeNode dummys so it's possible to iterate over them and null out the parent pointer, making it possible to plug the leak "on demand". This doesn't feel like a real solution and for now is only used in a test so those leaks doesn't obscure other leaks should any such surface. Change-Id: I6c0c60ba58df8d9d5eb6cc1c3a144ea31aa3810c Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/202682 Commit-Queue: Jens Johansen <jensj@google.com> Reviewed-by: Johnni Winther <johnniwinther@google.com>
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