Clang: Make file ids unique

Clang file ids are only unique for one query. Because we query in parallel
we have to manage our own unique ids.

Change-Id: I67d57d8b1766cab75ad252a14e57bbf9dc5fdb79
Reviewed-by: Tim Jenssen <tim.jenssen@qt.io>

src/libs/clangbackendipc/sourcerangewithtextcontainer.h

@@ -110,6 +110,8 @@ private:
     Utils::SmallString m_text;
 };
 
+using SourceRangeWithTextContainers = std::vector<SourceRangeWithTextContainer>;
+
 CMBIPC_EXPORT QDebug operator<<(QDebug debug, const SourceRangeWithTextContainer &container);
 std::ostream &operator<<(std::ostream &os, const SourceRangeWithTextContainer &container);
 } // namespace ClangBackEnd