onnxruntime

2b307111 - Add onnxruntime/test/run_benchmark.py helper script. (#19234)

Add onnxruntime/test/run_benchmark.py helper script. (#19234) ### Description Add onnxruntime/test/run_benchmark.py helper script to repeat benchmark runs until a target coefficient of variance is reached. It works with [Google Benchmark](https://github.com/google/benchmark) programs like `onnxruntime_mlas_benchmark`. ### Motivation and Context Sometimes there is variability in benchmark run results. This automates the repeated running needed to get results that are stable enough.