[llvm] [Offload] Add framework for math conformance tests (PR #149242)

[Joseph Huber via llvm-commits]

https://github.com/jhuber6 commented:

Everything looks good, but we should handle the tests in a single binary rather than splitting them between platforms and providers. The test should simply execute dependent on what the user could compile. Like if they had an AMDGPU machine with HIP math it should detect that and use the proper platform and launch the extra kernel.

https://github.com/llvm/llvm-project/pull/149242