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This patch renames the cxx-benchmark-unittests to check-cxx-benchmarks and converts the target to use LIT in order to make the tests run faster and provide better output. In particular this runs each benchmark in a suite one by one, allowing more parallelism while ensuring output isn't garbage with multiple threads. Additionally, it adds the CMake flag '-DLIBCXX_BENCHMARK_TEST_ARGS=<list>' to specify what options are passed when running the benchmarks. git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@346888 91177308-0d34-0410-b5e6-96231b3b80d8