[PATCH] D136332: [FuncSpec][NFC] Avoid redundant computations of DominatorTree/LoopInfo

[Momchil Velikov via Phabricator via llvm-commits]

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The `FunctionSpecialization` pass needs loop analysis results for its
cost function. For this purpose, it computes the `DominatorTree` and
`LoopInfo` for a function in `getSpecializationBonus`.  This function,
however, is called O(number of call sites x number of arguments), but
the DominatorTree/LoopInfo can be computed just once.

This patch plugs into the PassManager infrastructure to obtain
LoopInfo for a function and removes ad-hoc computation from
`getSpecializatioBonus`.


https://reviews.llvm.org/D136332

Files:
  llvm/include/llvm/Transforms/Utils/SCCPSolver.h
  llvm/lib/Transforms/IPO/FunctionSpecialization.cpp
  llvm/lib/Transforms/IPO/SCCP.cpp
  llvm/lib/Transforms/Utils/SCCPSolver.cpp

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