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When an output directory is specified, llvm-cov spawns some threads to speed up the process of writing out file reports. Add an option which allows users to control how many threads llvm-cov uses. A CommandGuide.rst update + test is included. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@307609 91177308-0d34-0410-b5e6-96231b3b80d8