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* doc/sourcebuild.texi (Test directives): Document that arguments include-opts and exclude-opts are now optional for dg-skip-if, dg-xfail-if, dg-xfail-run-if, and dg-shouldfail. * lib/target-supports-dg.exp (check-flags): Provide defaults for include-opts and exclude-opts; skip checking the flags if arguments are the same as the defaults. (dg-xfail-if): Verify the number of arguments, supply defaults for unspecified optional arguments. (dg-skip-if, dg-xfail-run-if): Verify the number of arguments. From-SVN: r157206
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