This is because lib/Fuzzer doesn't really depend on llvm infrastucture. It's not easy to access the llvm hardware_concurrency here. Differential Reivision: https://reviews.llvm.org/D38481 llvm-svn: 314870
libFuzzer was moved to compiler-rt in https://reviews.llvm.org/D36908. All future changes should be directed there. The copy of sources is temporarily left in this folder for the duration of a move.