[PATCH] D16740: [SelectionDAG] Eliminate exponential behavior in WalkChainUsers

[Owen Anderson via llvm-commits]

resistor accepted this revision.
resistor added a comment.
This revision is now accepted and ready to land.

Functionality LGTM.  I would add a comment at the use site of TokenFactorResult to point out that the walk is being memoized.


http://reviews.llvm.org/D16740