[lanai] LanaiSetflagAluCombiner more conservative
Summary: LanaiSetflagAluCombiner could previously combine instructions across basic building blocks even when not legal. Make the LanaiSetflagAluCombiner more conservative to avoid this. Reviewers: eliben Subscribers: joker.eph, llvm-commits Differential Revision: http://reviews.llvm.org/D18746 llvm-svn: 265411
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