Félix 042fccb510 Added -help option so sourcekitd-test ...

Added "-help" option to Options.td
Added also:
* Added "OPT_HELP" case in the main TestOptions.cpp switch. It uses the llvm options help functionality to provide up-to-date help
* Additional "Use -help for assistance" at the end of the error message that appears when calling an unknown option
Added their following tests, respectively::
* usage.swift, and
* wrong_arguments.swift

Extra: FIXME: in TestOptions::printHelp, suggesting a possible expansion for the printHelp option (details in file)

2017-04-22 15:06:48 -03:00

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