[PATCH] D104059: [WIP][Attributor] Derive AACallEdges attribute

[Kuter Dinel via Phabricator via llvm-commits]

kuter created this revision.
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This attribute computes the optimistic live call edges using the attributor
liveness information. This attribute will be used for deriving a
inter-procedural function reachability attribute.

WIP Notes:

- A test will be added.
- Is the handling of callbacks correct ? This handling is based on what `CallGraph` does. But `::getCallbackUses` function calls the `CB::getCalledFunction` and gives up if it gets a null value. More on this bellow.
- Should we implement `GraphTraits` ?
- Should we also have pessimistic information, if so should we just use the call graph info from LLVM, or derive it ourselves using the `isKnownDead`


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D104059

Files:
  llvm/include/llvm/Transforms/IPO/Attributor.h
  llvm/lib/Transforms/IPO/AttributorAttributes.cpp

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