[LV][TTI] Remove unused ReductionFlags. NFC (#129858) No in-tree targets currently use it in the preferInLoopReduction/preferPredicatedReductionSelect TTI hooks. It looks like it used to be used in LoopUtils, at least in 8ca60db40bd944dc5f67e0f200a403b4e03818ea, but I presume it was replaced by RecurrenceDescriptor.
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