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inspection in the proccess, and shuffle the logging in the DAG combiner around a bit. With this it is much easier to follow what the legalizer is doing. It should even accurately present most of the strange legalization operations where a single node is replaced by multiple nodes, etc. There is still some information lost (we log SDNodes not SDValues so we don't log which result is used for which thing), but I think this is much closer to a usable system. Notably, this will make it *much* more apparant when legalization is actually happening inside the combiner, or when there is a cycle caused by interactions of the legalizer and the combiner. The "bug" I fixed here I'm not sure is remotely possible to trigger. We were only adding one of the nodes in a replacement to the updated set rather than all of the nodes in the replacement. Realistically, the worst result of this are nodes not getting back onto the worklist in the DAG combiner. I doubt it is possible to trigger this today, and I certainly don't have any ideas about how, but this at least brings the code into alignment with the principled operation of the routine. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@214105 91177308-0d34-0410-b5e6-96231b3b80d8
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