[PATCH] D135982: [SimplifyCFG] Try unsigned case value for switch to lookup table

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Treat case value as unsigned when we find the min case in the switch is min signed value and max case is max signed value.
Fix: #56538


https://reviews.llvm.org/D135982

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

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