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1. we'd run simplifycfg at the very start, even though the per function passes have already cleaned this up. 2. In the main per-function pipeline that is interlaced with inlining etc, we would do instcombine, jump threading, simplifycfg *before* doing SROA. SROA is much more likely to expose opportunities for these passes than they are for SROA, so move SRoA up earlier. also add some comments. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@85742 91177308-0d34-0410-b5e6-96231b3b80d8
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