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remove the supportive for attachment/metadata (#281)

Summary:
Pull Request resolved: https://github.com/pytorch/executorch/pull/281

we do not support attachment/metadata for BP (bundled program) anymore. This diff removes such supportive.

Reviewed By: tarun292

Differential Revision: D49165742

fbshipit-source-id: e185cde2b1e127c8b843026d3383dc50d9e5b29f
S
Songhao Jia committed
348283015c6ff41864b82c8e8845262068525147
Parent: 4f3e5e6
Committed by Facebook GitHub Bot <facebook-github-bot@users.noreply.github.com> on 9/14/2023, 6:12:42 PM