Move build-script
argument parser to separate module
#11880
Merged
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Purpose
This PR simply moves the argument parsing logic from the
build-script
main function into a separate module. There are no functional changes here apart from wrapping up the parser instantiation into a newcreate_argument_parser
function. Having the parser in a separate module will allow for testing and stage future changes on the path to merging #11872.rdar://problem/34336890