[SLP] Simplify tryToFindDuplicates() (NFC) (#135766) This NFC aims to simplify the control-flow and interfaces used in tryToFindDuplicates(). The point is to make it easier to understand where decisions for scalar de-duplication are made. In particular: - Limit indentation - Rename some variables to better match their use case - Always give consistent outputs for VL and ReuseShuffleIndices. This makes it possible to use the same code for building gather TreeEntry everywhere. This also allows to remove the TryToFindDuplicates lambda.
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