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Add getUniqueReachingMIDef to RDA which performs a global search for a machine instruction that produces a unique definition of a given register at a given point. Also add two helper functions (getMIOperand) that wrap around this functionality to get the incoming definition uses of a given instruction. These now replace the uses of getReachingMIDef in ARMLowOverheadLoops. getReachingMIDef has been renamed to getReachingLocalMIDef and has been made private along with getInstFromId. Differential Revision: https://reviews.llvm.org/D74605
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