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Rename main to:

Delete channel

Delete main? This cannot be undone.

CMakeLists.txt
add_llvm_component_library(LLVMDemangle
  Demangle.cpp
  ItaniumDemangle.cpp
  MicrosoftDemangle.cpp
  MicrosoftDemangleNodes.cpp
  RustDemangle.cpp
  DLangDemangle.cpp

  ADDITIONAL_HEADER_DIRS
  "${LLVM_MAIN_INCLUDE_DIR}/llvm/Demangle"

)