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

[ioana ghiban via llvm-commits]

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+# Compile MLGO models expressed as MLIR to C++ headers via the EmitC pipeline.
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ioghiban wrote:

I would not mention EmitC. I'd refer to this path as either "MLIR-based" or "in-tree".

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