Commit 181816fe authored by Justin Lebar's avatar Justin Lebar Committed by TensorFlower Gardener
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Speed up TuplePointsToAnalysis. 

This analysis is one of the most expensive parts of the HLO optimization
pipeline.

 - Avoid one or two unnecessary hashtable lookups in
   PopulateDefinedBuffersAndAliases.

 - Add a mode to ShapeTree wherein we avoid copying Shapes.

 - Use templated functors rather than std::function in ShapeTree's
   iterators, thus avoiding the overhead of std::function.

PiperOrigin-RevId: 160487485
parent e6a45475
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