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bcb39a444b
a SmallPtrSet. Currently, there is no need for stable iteration in this dimension, and I now thing there won't need to be going forward. If this is ever re-introduced in any form, it needs to not be a SetVector based solution because removal cannot be linear. There will be many SCCs with large numbers of parents. When encountering these, the incremental SCC update for intra-SCC edge removal was quadratic due to linear removal (kind of). I'm really hoping we can avoid having an ordering property here at all though... git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@207091 91177308-0d34-0410-b5e6-96231b3b80d8
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