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Use compile specs for backend configuration (#1820)

Summary:
Move the compiler flags passed to the backend up to the user in order to target different configurations.

Pull Request resolved: https://github.com/pytorch/executorch/pull/1820

Reviewed By: mergennachin

Differential Revision: D53486569

Pulled By: cccclai

fbshipit-source-id: ae2ac3a3e6384e503587a84c099875652a877edc
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Per Åstrand committed
637d066971a1267abfe0ef4d75fd52d6b7f7fdda
Parent: cc75b63
Committed by Facebook GitHub Bot <facebook-github-bot@users.noreply.github.com> on 2/7/2024, 12:01:08 AM