Commit 8622f05a authored by Sanjoy Das's avatar Sanjoy Das Committed by TensorFlower Gardener
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Don't CHECK-fail on malformed graphs in deadness analysis 

Instead return a friendlier failed Status from the following two methods which
used to CHECK-fail before:  GetIncomingPreds, FindUniqueBackedge.

While at it, also rename GetIncomingPreds to GetInputPreds to be consistent with
the variable names.

PiperOrigin-RevId: 215758757
parent 100714d9
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