Use sched_getaffinity instead of std::thread::hardware_concurrency. The issue with std::thread::hardware_concurrency is that it forwards to libc and some implementations (like glibc) don't take thread affinity into consideration. With this change a llvm program that can execute in only 2 cores will use 2 threads, even if the machine has 32 cores. This makes benchmarking a lot easier, but should also help if someone doesn't want to use all cores for compilation for example. git-svn-id: svn://svn.chromium.org/llvm-project/llvm/trunk/lib/Fuzzer@314809 0b72dbe1-c17f-4bc7-b9db-2b4152be0356
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