[PhaseOrdering] add tests for vector cmp reductions; NFC
These are based on PR41312. There needs to be effort from all of SimplifyCFG, InstCombine, SLP, and possibly VectorCombine to get this into ideal form.
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These are based on PR41312. There needs to be effort from all of SimplifyCFG, InstCombine, SLP, and possibly VectorCombine to get this into ideal form.