Richard Sandiford 737ca5f7ab Fix pattern sort in DAGISelEmitter.cpp
The old code skipped one of the sorting criteria if either pattern had
no types.  This could lead to cycles of the form X < Y, Y < Z, Z < X.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@191735 91177308-0d34-0410-b5e6-96231b3b80d8
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