Clang: Provide highlighting for identifier under cursor

Change-Id: I80ffe23cbcc84ab7323124581d9dd6afbe974fd0
Reviewed-by: Marco Bubke <marco.bubke@qt.io>

src/tools/clangbackend/ipcsource/clangjobqueue.h

@@ -52,7 +52,7 @@ public:
             const IsJobRunningForJobRequestHandler &isJobRunningHandler);
 
 public: // for tests
-    JobRequests queue() const;
+    JobRequests &queue();
     int size() const;
     void prioritizeRequests();