Daniel Dunbar 7a90e04fc7 Revert r127953, "SimplifyCFG has stopped duplicating returns into predecessors
to canonicalize IR", it broke a lot of things.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@127954 91177308-0d34-0410-b5e6-96231b3b80d8
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