Eliminate debugger overhead when running gnark

[kustosz]

Following https://github.com/golang/go/issues/57651, we change how golang runs in debugger mode, resulting in Gnark becoming one of the strongest contenders. The proper setting is added to the xcode project and should be runnable immediately. The regenerated graphs follow a test on other benchmarks, showing that my phone is identical in performance to the one used originally (little surprise, it's the same model) – which means the new image can be shared without fears of any bias.