Add autodiff building simulator benchmark

[asl]

[asl]

Autodiff relies heavily on inlining and closure optimizations, so some non-trivial code shows the impact of optimizations. Usually the difference for reverse pass (derivative calculation, corresponds to AutoDiffBuildingSimulator.Reverse) is ~10x for Benchmark_O vs Benchmark_Onone.

[asl]

@swift-ci please test

[asl]

@swift-ci please benchmark

[asl]

Tagging @JaapWijnen