This PR runs benchmarks on a 32 threads (A single warp on NVPTX) by default, adding the option for single threaded benchmarks. We can specify that a benchmark should be run on a single thread using the `SINGLE_THREADED_BENCHMARK()` macro. I chose to use a flag here so that other options could be added in the future.
LLVM libc ========= This directory and its subdirectories contain source code for llvm-libc, a retargetable implementation of the C standard library. LLVM is open source software. You may freely distribute it under the terms of the license agreement found in LICENSE.txt.