add swift::

Author: David Ungar

tools/SourceKit/lib/SwiftLang/SwiftEditorDiagConsumer.h

@@ -70,7 +70,7 @@ class EditorDiagConsumer : public swift::DiagnosticConsumer {
                         swift::DiagnosticKind Kind, StringRef FormatString,
                         ArrayRef<swift::DiagnosticArgument> FormatArgs,
                         const swift::DiagnosticInfo &Info,
-                        SourceLoc bufferIndirectlyCausingDiagnostic) override;
+                        swift::SourceLoc bufferIndirectlyCausingDiagnostic) override;
 };
 
 } // namespace SourceKit