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Fixes #95. CPU-only mode is enabled by setting the `is_cpu_only` property while defining a benchmark, e.g. `NVBENCH_BENCH(foo).set_is_cpu_only(true)`. An optional `nvbench::exec_tag::no_gpu` hint can also be passed to `state.exec` to avoid instantiating GPU benchmarking backends. Note that a CUDA compiler and CUDA runtime are always required, even if all benchmarks in a translation unit are CPU-only. Similarly, a new `nvbench::exec_tag::gpu` hint can be used to avoid compiling CPU-only backends for GPU benchmarks.