[issue18578] Rename and document test.bytecode_helper as test.support.bytecode_helper

[Nick Coghlan]

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

Just noting for the record that the reason a new warning wasn't needed here is because there is already a general "No compatibility guarantees" warning for the entire test package: https://docs.python.org/3/library/test.html

Thanks for getting this resolved!

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