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45fb79bc54
the loop header has a non-loop predecessor which has been pre-fused into its chain due to unanalyzable branches. In this case, rotating the header into the body of the loop in order to place a loop exit at the bottom of the loop is a Very Bad Idea as it makes the loop non-contiguous. I'm working on a good test case for this, but it's a bit annoynig to craft. I should get one shortly, but I'm submitting this now so I can begin the (lengthy) performance analysis process. An initial run of LNT looks really, really good, but there is too much noise there for me to trust it much. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@154395 91177308-0d34-0410-b5e6-96231b3b80d8
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