[LV] Add tests for FindLast reductions with nested phis (NFC). (#230640) Add tests where the data value of a FindLast reduction is itself a phi that yields the reduction phi on some paths, e.g. via a nested if. Both are currently miscompiled, as the outer condition is used as the condition for updating the reduction. Also enable masked memory ops and regenerate checks with the latest UTC version to make checks more compact without loss of generality.
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