[PATCH] D154852: [FuncSpec] Add Phi nodes to the InstCostVisitor.

[Alexandros Lamprineas via Phabricator via llvm-commits]

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This patch allows constant folding of PHIs when estimating the user bonus. Phi
nodes are a special case since some of their inputs may remain unresolved until
all the specialization arguments have been processed by the InstCostVisitor.
Therefore, we keep a list of dead basic blocks and then lazily visit the Phi nodes
once the user bonus has been computed for all the specialization arguments.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D154852

Files:
  llvm/include/llvm/Transforms/IPO/FunctionSpecialization.h
  llvm/lib/Transforms/IPO/FunctionSpecialization.cpp
  llvm/unittests/Transforms/IPO/FunctionSpecializationTest.cpp

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