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Add init context

Summary: Similar to other places we use context to inject runtime related information. The `BackendInitContext` will wrap `runtime_allocator` for `backend.init`.

Reviewed By: dbort

Differential Revision: D48872101

fbshipit-source-id: a8c35317db94077f470aa2063e5b6f81dd85f64f
C
Chen Lai committed
38277dab6870332d9d24446f2090b654868c019a
Parent: 32acb60
Committed by Facebook GitHub Bot <facebook-github-bot@users.noreply.github.com> on 9/11/2023, 10:34:50 PM