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Doing this with a hash map doesn't change behavior and avoids calling isIdenticalTo O(n^2) times. This should probably eventually move into a utility class shared with EarlyCSE and the limited CSE in the SLPVectorizer. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@193926 91177308-0d34-0410-b5e6-96231b3b80d8