[PATCH] D150943: (WIP)[SimplifyCFG] add nsw on BuildLookuptable LinearMap calculation

[Kohei Asano via Phabricator via llvm-commits]

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TODO: clean to get MaxIndex

1-c step of https://reviews.llvm.org/D146903


https://reviews.llvm.org/D150943

Files:
  llvm/lib/Transforms/Utils/SimplifyCFG.cpp
  llvm/test/Transforms/SimplifyCFG/X86/switch_to_lookup_table.ll

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