[llvm] [MLGO] Model selection for models lowered through EmitC (PR #212650)

[ioana ghiban via llvm-commits]

ioghiban wrote:

Thank you for the updates! Could you please provide the expected CMake config needed to test these changes here or in the [tracking issue](https://github.com/llvm/llvm-project/issues/199007)?

https://github.com/llvm/llvm-project/pull/212650