[clang] [Clang] Warning as error for fold expressions over comparison operators (PR #136836)

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cor3ntin wrote:

> Okay, let's go ahead as is. Though I feel it's unfortunate that the warnings for left fold and right fold are scattered - maybe we could clean them up in future

This is not the case, there is a warning for the fold case (regardless of direction) in TreeTransform, and a different warning for the non-fold case in CreateBinOp

https://github.com/llvm/llvm-project/pull/136836