[SystemZ] Enable LoopDataPrefetch pass.
Loop data prefetching has shown some improvements on benchmarks, and is enabled at -O1 and above. Review: Ulrich Weigand llvm-svn: 308024
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Loop data prefetching has shown some improvements on benchmarks, and is enabled at -O1 and above. Review: Ulrich Weigand llvm-svn: 308024