Craig Topper 140427ab5e [DAGISel] When checking if chain node is foldable, make sure the intermediate nodes have a single use across all results not just the result that was used to reach the chain node.
This recovers a test case that was severely broken by r296476, my making sure we don't create ADD/ADC that loads and stores when there is also a flag dependency.

llvm-svn: 296486
2017-02-28 16:52:05 +00:00
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