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LLAMA demo app fix (#2457)

Summary:
Pull Request resolved: https://github.com/pytorch/executorch/pull/2457

* Fix internal build
* For OSS, add xnnpack backend.

Reviewed By: mcr229

Differential Revision: D54958566

fbshipit-source-id: a82e64aade54895124a0c3f459033a2c0e62c312
H
Hansong Zhang committed
e76cd88904aaa5ea4c661afb764a29c9c42b8100
Parent: 22707f0
Committed by Facebook GitHub Bot <facebook-github-bot@users.noreply.github.com> on 3/15/2024, 10:01:24 PM