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6518f5fcbf
problem was that we previously hashed based on the pointers of the left and right children, but this is bogus: we can easily have different trees that represent the same set. Now we use a hashing based scheme that compares the *contents* of the trees, but not without having to do a full scan of a tree. The only caveat is that with hashing is that we may have collisions, which result in two different trees being falsely labeled as equivalent. If this becomes a problem, we can add extra data to the profile to hopefully resolve most collisions. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@46224 91177308-0d34-0410-b5e6-96231b3b80d8
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