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90b7b12f01
Clean up the patterns, fix comments, and avoid confusing both tools and coders. Note that the special adds/subs SelectionDAG nodes no longer have the dummy cc_out operand. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@142397 91177308-0d34-0410-b5e6-96231b3b80d8