[build-script-helper] Switch the --no-clean
flag to --clean
and have it actually do something
#1558
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Instead, swiftlang/swift#75053 makes sure
build-script
doesn't pass in the flag bydefault, so you can explicitly invoke it only when needed.
This simply reverts 37d003e and renames the flag, so the flag can be invoked when needed and the build will be cleaned again.