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for a basic block, use it when the block is defined instead of deleting it and creating a new one. Also, only create at most ONE forward reference for any block, instead of one for each forward reference. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@14807 91177308-0d34-0410-b5e6-96231b3b80d8