Convert calculate_output_groups.py
into a Swift binary
#3019
+620
−465
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Performance is better than (but comparable to) the python script. Perhaps more importantly, the program looks specifically for the build-request.json file and uses its modification date to compare against the build_marker file's date, instead of comparing the parent .xcbuilddata directory. Not sure if that'll make a difference, but it's a distinction worth calling out.