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In CombineToPreIndexedLoadStore, when the offset is a constant, we have code that looks for other uses of the pointer which are constant offset computations so that they can be rewritten in terms of the updated pointer so that we don't need to keep a copy of the base pointer to compute these constant offsets. Unfortunately, when it iterated over the uses, it did so by SDNodes, and so we could confuse ourselves if the base pointer was produced by a node that had multiple results (because we would not immediately exclude uses of the other node results). This was reported as PR22755. Unfortunately, we don't have a test case (and I've also been unable to produce one thus far), but at least the mistake is clear. The right way to fix this problem is to make use of the information contained in the use iterators to filter out any uses of other results of the node producing the base pointer. This should be mostly NFC, but should also fix PR22755 (for which, unfortunately, we have no in-tree test case). llvm-svn: 237576
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