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pass. One of the callers of isKilled() can cope with overapproximation of kills and the other can't, so I added a flag to indicate this. In theory this could pessimize code slightly, but in practice most physical register uses are kills, and most important kills of physical registers are the only uses of that register prior to register allocation, so we can recognize them as kills even without kill flags. This is relevant because LiveIntervals gets rid of all kill flags. llvm-svn: 175821
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