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51901d85f7
fallthrough) in cases where we might fail to rotate an exit to an outer loop onto the end of the loop chain. Having *some* rotation, but not performing this rotation, is the primary fix of thep performance regression with -enable-block-placement for Olden/em3d (a whopping 30% regression). Still working on reducing the test case that actually exercises this and the new rotation strategy out of this code, but I want to check if this regresses other test cases first as that may indicate it isn't the correct fix. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@145195 91177308-0d34-0410-b5e6-96231b3b80d8
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