bpo-42199: Fix bytecode_helper assertNotInBytecode (#23031)

* bpo-42199: Fix bytecode_helper assertNotInBytecode

Add tests.

* 📜🤖 Added by blurb_it.

Co-authored-by: Dino Viehland <dinoviehland@fb.com>
Co-authored-by: blurb-it[bot] <43283697+blurb-it[bot]@users.noreply.github.com>
3 files changed