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when the unconditional branch destination is the fallthrough block. The canonicalization makes it easier to allow optimizations on DAGs to invert conditional branches. The branch folding pass (and AnalyzeBranch) will clean up the unnecessary unconditional branches later. This is one of the patches leading up to disabling codegen prepare critical edge splitting. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@114630 91177308-0d34-0410-b5e6-96231b3b80d8
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