Hide kwcall frames in stacktraces again (#63192)
* Handle CodeInstance linfo
* Add test
* comment on purpose of branch
* Use existing helper method
Co-authored-by: Andy Dienes <51664769+adienes@users.noreply.github.com>
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Co-authored-by: Andy Dienes <51664769+adienes@users.noreply.github.com>