[SDAG] Fix CombineTo ordering in visitZERO_EXTEND and visitSIGN_EXTEND
Reorder CombineTo Calls to prevent references to stale/deleted SDNodes which caused undue assertions. Reviewers: dbabokin Subscribers: aemerson, rengolin, llvm-commits Differential Revision: https://reviews.llvm.org/D31625 llvm-svn: 304460
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