Debugger: use Qt version from kit as fallback for dumper

Fixes: QTCREATORBUG-26456
Change-Id: If2cd664212b3fa07d7abaef7a1173f79716884bb
Reviewed-by: hjk <hjk@qt.io>

src/plugins/debugger/lldb/lldbengine.cpp

@@ -262,6 +262,10 @@ void LldbEngine::setupEngine()
         runCommand(cmd);
     }
 
+    DebuggerCommand cmd0("setFallbackQtVersion");
+    cmd0.arg("version", "0x" + QString::number(rp.fallbackQtVersion, 16));
+    runCommand(cmd0);
+
     DebuggerCommand cmd1("loadDumpers");
     cmd1.callback = [this](const DebuggerResponse &response) {
         watchHandler()->addDumpers(response.data["dumpers"]);