[PATCH] D53106: [SelectionDAG] Fix behavior topological ordering with regards to glued nodes.

[Nirav Dave via Phabricator via llvm-commits]

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Summarizing offline discussion with jyknight for future reference:

This should only be necessary due to glued nodes that are not Copy{To,From}Reg and which have additional predecessors/successors than nodes on the glue. 
This appear to only occur in the case of ADDC/ADDE nodes have been deprecated.

This patch was originally written for such an instance in the AVR backend.


Repository:
  rL LLVM

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https://reviews.llvm.org/D53106