[SLP]Prefer copyable over alternate If the instructions state is alternate and/or contains non-directly matching instructions, need to check if it is better to represent such operations as non-alternate with copyables. To do this, we need to compare operands between the instructions in their different representations and choose the best one for optimal vectorization. Reviewers: RKSimon, hiraditya Pull Request: https://github.com/llvm/llvm-project/pull/183777
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