[libc-commits] [libc] [libc] init uefi (PR #131246)

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lntue wrote:

> This looks fine for now, but you need to get a buildbot ready before it lands.

I think for new targets like this, it's ok as long as there is a plan for a buildbot setup in the near future.
Essentially, these initial commits are needed in order to setting up a CI for the targets.

https://github.com/llvm/llvm-project/pull/131246