[PATCH] D152773: [SCCP] Propagate undef when visiting some instructions

[luxufan via Phabricator via llvm-commits]

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If a value lattice is constantrange_including_undef, replaceSignInst to
unsigned Inst is invalid. But SCCPSolver didn't propagate undef when
visiting some instructions. This patch fixes this.

https://alive2.llvm.org/ce/z/85Ec-i
https://alive2.llvm.org/ce/z/jVZf67
https://alive2.llvm.org/ce/z/hZCw7k


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D152773

Files:
  llvm/lib/Transforms/Utils/SCCPSolver.cpp
  llvm/test/Transforms/SCCP/ashr.ll
  llvm/test/Transforms/SCCP/ranges-sext.ll

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