Chris Lattner 4aafb4ff92 Add a simple missing fold to produce this:
subfic r3, r2, 33

instead of this:

        subfic r2, r2, 32
        addi r3, r2, 1


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@25255 91177308-0d34-0410-b5e6-96231b3b80d8
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