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Loop transformations can sometimes fail because the loop, while in valid rotated LCSSA form, is not in a canonical CFG form. This is an extremely simple pass that just merges obviously redundant blocks, which can be used to fix some known failure cases. In the future, it may be enhanced with more cases (and have code shared with SimplifyCFG). This allows us to run LoopSimplifyCFG -> LoopRotate -> LoopUnroll, so that SimplifyCFG cleans up the loop before Rotate tries to run. Not currently used in the pass manager, since this pass doesn't do anything unless you can hook it up in an LPM with other loop passes. It'll be added once Chandler cleans up things to allow this. Tested in a custom pipeline out of tree to confirm it works in practice (in addition to the included trivial test). git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@259256 91177308-0d34-0410-b5e6-96231b3b80d8
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