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Instead of manually computing DT and PDT, we can get the from the pass manager, which ideally has them already cached. With the new pass manager, we could even preserve DT/PDT on a per function basis in a module pass. I think this also addresses the TODO about re-using the computed DTs for BFI. IIUC, GetBFI will fetch the DT from the pass manager and when we will fetch the cached version later. Reviewers: vsk, hiraditya, tejohnson, thegameg, sebpop Reviewed By: vsk Differential Revision: https://reviews.llvm.org/D57092 llvm-svn: 352036