Consider Contexts to be user objects for purposes of Obervatory's dominator analysis.
Consider Contexts to be user objects for purposes of Obervatory's dominator analysis.

User data in may be reachable only through a closure's environment, represented as a Context object. Note we still don't consider Functions to be user objects here, and so avoid blaming the size of compiled code against any user object.

R=cbernaschina@google.com

Review-Url: https://codereview.chromium.org/2947673002 .

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