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Rename main to:

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Delete main? This cannot be undone.

BUILD.gn
static_library("Reader") {
  output_name = "LLVMBitReader"
  deps = [
    "//llvm/include/llvm/Config:llvm-config",
    "//llvm/lib/Bitstream/Reader",
    "//llvm/lib/IR",
    "//llvm/lib/Support",
  ]

  sources = [
    "BitReader.cpp",
    "BitcodeAnalyzer.cpp",
    "BitcodeReader.cpp",
    "MetadataLoader.cpp",
    "ValueList.cpp",
  ]
}