[llvm] [OFFLOAD] Add plugin with support for Intel oneAPI Level Zero (PR #158900)

[Alex Duran via llvm-commits]

adurang wrote:

> > > By the way unless this passes all the existing tests it should be disabled by default.
> > 
> > 
> > There's no testing in this PR.
> 
> It probably doesn't enable it as a backend for the OpenMP tests, but I'd imagine it would show up in platform detection for the offloading ones.

I checked this, and they're not run. It would need to be explicitly add it in the CMakeLists.txt of unittests.

https://github.com/llvm/llvm-project/pull/158900