Chris Lattner 44cf390784 * Move isEquivalentTo implementations to NodeImpl
* Implement a new form of node folding to catch cases missed in Addtree
* Add removeIndistinguishableNodePairs to merge calls (todo) and globals


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@2062 91177308-0d34-0410-b5e6-96231b3b80d8
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