[llvm] [mlir] [mlir][EmitC] Add MathToEmitC pass for math function lowering to EmitC (PR #113799)

[Simon Camphausen via llvm-commits]

https://github.com/simon-camp approved this pull request.

LGTM, just found two errors in comments.

https://github.com/llvm/llvm-project/pull/113799