Clang: Add clang query

Clang query is mechanism to use AST matcher to search for code. Think
about regular expression but in the context of AST. So you get a semantic
search tool for C++.

Change-Id: I72e882c5b53a0c52f352a3664847c4c3e4f6fc2e
Reviewed-by: Tim Jenssen <tim.jenssen@qt.io>

src/libs/clangbackendipc/refactoringclientproxy.cpp

@@ -29,6 +29,7 @@
 #include "messageenvelop.h"
 #include "refactoringserverinterface.h"
 #include "sourcelocationsforrenamingmessage.h"
+#include "sourcerangesanddiagnosticsforquerymessage.h"
 
 #include <QDebug>
 #include <QIODevice>
@@ -79,4 +80,9 @@ void RefactoringClientProxy::sourceLocationsForRenamingMessage(SourceLocationsFo
     writeMessageBlock.write(message);
 }
 
+void RefactoringClientProxy::sourceRangesAndDiagnosticsForQueryMessage(SourceRangesAndDiagnosticsForQueryMessage &&message)
+{
+    writeMessageBlock.write(message);
+}
+
 } // namespace ClangBackEnd