[llvm] [NVPTX] Restrict BFE selection to native targets (PR #228685)

[Alex MacLean via llvm-commits]

AlexMaclean wrote:

@wenhu1024  https://llvm.org/docs/Contributing.html

> If you have received no comments on your patch for a week, you can request a review by ‘ping’ing the GitHub PR with “Ping” in a comment. The common courtesy ‘ping’ rate is once a week. Please remember that you are asking for valuable time from other professional developers.

I appreciate your strong interest in contributing to NVPTX! However, I'd encourage a little more discernment and care when opening patches and requesting review. Many recent PRs have required substantial revisions or been closed without merging and could be characterized as [extractive](https://llvm.org/docs/AIToolPolicy.html#extractive-contributions).

https://github.com/llvm/llvm-project/pull/228685