[SLP]Fix last instruction selection for vectorized last instruction in SplitVectorize nodes If the last instruction in the SplitVectorize node is vectorized and scheduled as part of some bundles, the SplitVectorize node might be placed in the wrong order, leading to a compiler crash. Need to check if the vectorized node has vector value and place the SplitVectorize node after the vector instruction to prevent a compile crash. Fixes issue reported in https://github.com/llvm/llvm-project/pull/133091#issuecomment-2782826805
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