[SLP]Allow interleaving check only if it is less than number of elements

Need to check if the interleaving factor is less than total number of
elements in loads slice to handle it correctly and avoi

[SLP]Allow interleaving check only if it is less than number of elements

Need to check if the interleaving factor is less than total number of
elements in loads slice to handle it correctly and avoid compiler crash.

Fixes report https://github.com/llvm/llvm-project/pull/112361#issuecomment-2457227670

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