Swift arguments file doesn't support sources with spaces

If you provide Swift with a file to use as the arguments, file paths with spaces are not correctly handled. Example:

touch "foo bar.swift"
echo "foo bar.swift" > arguments.txt
swiftc @arguments.txt
<unknown>:0: error: no such file or directory: 'bar.swift'

I assume since there is an argument per line these files should correctly handle spaces?

Original change https://github.com/apple/swift/pull/16362