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Rename main to:

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Delete main? This cannot be undone.

CMakeLists.txt
set(LLVM_LINK_COMPONENTS core support object coverage profiledata)

add_llvm_tool(llvm-cov
  llvm-cov.cpp
  gcov.cpp
  CodeCoverage.cpp
  CoverageExporterJson.cpp
  CoverageExporterLcov.cpp
  CoverageFilters.cpp
  CoverageReport.cpp
  CoverageSummaryInfo.cpp
  SourceCoverageView.cpp
  SourceCoverageViewHTML.cpp
  SourceCoverageViewText.cpp
  TestingSupport.cpp
  )