Previously the getter VariableBase.context was redirecting to
VariableBase.parent, effectively requiring a change of the ownership
over the variable. This CL makes VariableBase.context a field of
VariableBase, allowing for the previously existing ownership structure
of the AST tree nodes.
The change allows to avoid workarounds for the existing
ownership-restoring logic, such as the assignments to the `parent`
pointer made in the constructors of the AST nodes and their
`transformChildren` and `transformOrRemoveChildren` methods.
Part of https://github.com/dart-lang/sdk/issues/61572
Change-Id: I307c9d2b23c8201f8d7d2a100acf9fb8f3af2572
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/494441
Commit-Queue: Chloe Stefantsova <cstefantsova@google.com>
Reviewed-by: Johnni Winther <johnniwinther@google.com>
Chloe Stefantsova
09a156bb2d