Preserve relative ordering in ParsedOptions.arguments(for options:) #232
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Another small bugfix: according to swiftlang/swift#8134, the relative ordering of "-F" and "-Fsystem" search paths needs to be preserved in frontend invocations. Instead of introducing a special case, I just changed the behavior of ParsedOptions.arguments(for options:) since it shouldn't be that expensive to always sort the options and I'm guessing this isn't the only case where it could end up mattering for correctness.