[issue44590] Create frame objects lazily when needed

[Nick Coghlan]

Nick Coghlan <ncoghlan at gmail.com> added the comment:

The newly linked pull request isn't actually for this ticket, it's for bpo-44800, a follow-up refactoring proposal related to the variable, struct field, and API naming schemes used for the new lighter weight execution frames.

However, the commit message and PR description refer back to this ticket as well, so the RoundUp automation picked it up.

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<https://bugs.python.org/issue44590>
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