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(PromoteAbstractToConcrete), and to use a set to avoid recomputation. In particular, this set eliminates the potentially exponential cases from this little recursive algorithm. On a particularly nasty testcase, llvm-dis on the .bc file went from 34 minutes (which is when I killed it, it still hadn't finished) to 0.57s. Remember kids, exponential algorithms are bad. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@16772 91177308-0d34-0410-b5e6-96231b3b80d8
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