[SystemZ] Prefer comparisons with zero
Convert >= 1 to > 0, etc. Using comparison with zero isn't a win on its own, but it exposes more opportunities for CC reuse (the next patch). llvm-svn: 187571
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Convert >= 1 to > 0, etc. Using comparison with zero isn't a win on its own, but it exposes more opportunities for CC reuse (the next patch). llvm-svn: 187571