Chris Lattner 3e27b1f5c4 implement a couple of simple shift foldings.
e.g.  (X & 7) >> 3   -> 0


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@22774 91177308-0d34-0410-b5e6-96231b3b80d8
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