Revert "[dynamo] Add BACKEND_MATCH guard to detect and recompile when backend changes (#107337)"
This reverts commit 1a64ec7dd48408d6839a5c2cceb55b0c4be2243b.
Reverted https://github.com/pytorch/pytorch/pull/107337 on behalf of https://github.com/huydhn due to Sorry for reverting your change but inductor perf smoke test starts to regress after this ([comment](https://github.com/pytorch/pytorch/pull/107337#issuecomment-1710974588))
