[XLA] Directly track callers and callees of an HloComputation. #23516
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Currently there's no direct way to navigate from an HloComputation to its callers and callees. To determine the callees, one must iterate through all of the instructions in a computation, which can be slow. And there is no way to navigate to the callers of a computation other than iterating over all the computations in a module. This change adds absl::btree_map<> data structures that allow one to navigate from an HloComputation to its callers and callees. For each neighbor, we keep a count of the number of references. PiperOrigin-RevId: 734235296
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[XLA] Directly track callers and callees of an HloComputation.
Currently there's no direct way to navigate from an HloComputation to its callers and callees. To determine the callees, one must iterate through all of the instructions in a computation, which can be slow. And there is no way to navigate to the callers of a computation other than iterating over all the computations in a module.
This change adds absl::btree_map<> data structures that allow one to navigate from an HloComputation to its callers and callees. For each neighbor, we keep a count of the number of references.