Commit 3eeaf9f1 authored by Eugene Zhulenev's avatar Eugene Zhulenev Committed by TensorFlower Gardener
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[Grappler] Preserve constness of the GraphDef in GraphView. 

1. Split GrapView into GraphView and MutableGraphView with separate {Input/Output}Port types with different node pointer constness.

2. Properly use GraphView and MutableGraphView in graph properties, and get rid of const_cast.

3. Remove const_cast in function optimizer.

4. Migrate GraphView to absl containers and hash

PiperOrigin-RevId: 219488040
parent 92e60406
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