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Nirav Dave 5fc240a5b6 Recommitting Craig Topper's patch now that r296476 has been recommitted.
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.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@297698 91177308-0d34-0410-b5e6-96231b3b80d8
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