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/refactoringclientinterface.cpp

@@ -27,6 +27,7 @@
 
 #include "messageenvelop.h"
 #include "sourcelocationsforrenamingmessage.h"
+#include "sourcerangesanddiagnosticsforquerymessage.h"
 
 #include <QDebug>
 
@@ -41,6 +42,9 @@ void RefactoringClientInterface::dispatch(const MessageEnvelop &messageEnvelop)
         case MessageType::SourceLocationsForRenamingMessage:
             sourceLocationsForRenamingMessage(messageEnvelop.message<SourceLocationsForRenamingMessage>());
             break;
+        case MessageType::SourceRangesAndDiagnosticsForQueryMessage:
+            sourceRangesAndDiagnosticsForQueryMessage(messageEnvelop.message<SourceRangesAndDiagnosticsForQueryMessage>());
+            break;
         default:
             qWarning() << "Unknown IpcClientMessage";
     }