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ba77f37392
SelectionDAG already had begin/end methods for iterating over all the nodes, but didn't define an iterator_range for us in foreach loops. This adds such a method and uses it in some of the eligible places throughout the backends. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@242212 91177308-0d34-0410-b5e6-96231b3b80d8
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