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Iterating over the children of each node in the potential vectorization plan must happen in a deterministic order (because it affects which children are erased when two children conflict). There was no need for this data structure to be a map in the first place, so replacing it with a vector is a small change. I believe that this was the last remaining instance if iterating over the elements of a Dense* container where the iteration order could matter. There are some remaining iterations over std::*map containers where the order might matter, but so long as the Value* for instructions in a block increase with the order of the instructions in the block (or decrease) monotonically, then this will appear to be deterministic. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@167942 91177308-0d34-0410-b5e6-96231b3b80d8
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