Commit 4c24ab2d authored by A. Unique TensorFlower's avatar A. Unique TensorFlower Committed by TensorFlower Gardener
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[TF:XLA] Fix infinite loop in HLO data flow analysis. 

Merge input values at phi nodes correctly: If a phi operand is the phi itself,
and the other operands are all the same, then the phi node is redundant.

PiperOrigin-RevId: 181521522
parent 69f23113
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