[SourceKit] Add option for returning fully qualified types in variable type request

tools/SourceKit/lib/SwiftLang/SwiftLangSupport.h

@@ -693,7 +693,7 @@ public:
 
   void collectVariableTypes(
       StringRef FileName, ArrayRef<const char *> Args,
-      Optional<unsigned> Offset, Optional<unsigned> Length,
+      Optional<unsigned> Offset, Optional<unsigned> Length, bool FullyQualified,
       SourceKitCancellationToken CancellationToken,
       std::function<void(const RequestResult<VariableTypesInFile> &)> Receiver)
       override;