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This doesn't change how many times we construct domtrees in the normal pipeline, and it removes fragility and instability where basic-aa may not be run in time to see domtrees because they happen to be constructed afterward. This isn't quite as clean as the change to memdep because there is a mode where basic-aa specifically runs without domtrees -- in the hacking version used by function-attrs with the legacy pass manager. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@263234 91177308-0d34-0410-b5e6-96231b3b80d8
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