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/refactoringserverinterface.cpp

@@ -27,6 +27,7 @@
 
 #include "messageenvelop.h"
 #include "requestsourcelocationforrenamingmessage.h"
+#include "requestsourcerangesanddiagnosticsforquerymessage.h"
 
 #include <QDebug>
 
@@ -41,6 +42,9 @@ void RefactoringServerInterface::dispatch(const MessageEnvelop &messageEnvelop)
         case MessageType::RequestSourceLocationsForRenamingMessage:
             requestSourceLocationsForRenamingMessage(messageEnvelop.message<RequestSourceLocationsForRenamingMessage>());
             break;
+        case MessageType::RequestSourceRangesAndDiagnosticsForQueryMessage:
+            requestSourceRangesAndDiagnosticsForQueryMessage(messageEnvelop.message<RequestSourceRangesAndDiagnosticsForQueryMessage>());
+            break;
         default:
             qWarning() << "Unknown IpcClientMessage";
     }