[reassociate] Switch two std::sort calls into std::stable_sort calls as
their inputs come from std::stable_sort and they are not total orders. I'm not a huge fan of this, but the really bad std::stable_sort is right at the beginning of Reassociate. After we commit to stable-sort based consistent respect of source order, the downstream sorts shouldn't undo that unless they have a total order or they are used in an order-insensitive way. Neither appears to be true for these cases. I don't have particularly good test cases, but this jumped out by inspection when looking for output instability in this pass due to changes in the ordering of std::sort. llvm-svn: 202196
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