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APIs and replace it and numerous booleans with an option struct. The critical edge splitting API has a really large surface of flags and so it seems worth burning a small option struct / builder. This struct can be constructed with the various preserved analyses and then flags can be flipped in a builder style. The various users are now responsible for directly passing along their analysis information. This should be enough for the critical edge splitting to work cleanly with the new pass manager as well. This API is still pretty crufty and could be cleaned up a lot, but I've focused on this change just threading an option struct rather than a pass through the API. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@226456 91177308-0d34-0410-b5e6-96231b3b80d8
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