Debugger: Initialize members of OperatorNameNode

Change-Id: I662034e92687e228777c5a7983e799ffa90d9237
Reviewed-by: hjk <hjk@qt.io>

src/plugins/debugger/namedemangler/parsetreenodes.h

@@ -290,7 +290,7 @@ private:
     void parse();
     QByteArray description() const;
 
-    Type m_type;
+    Type m_type = VendorType;
 };
 
 class ExprPrimaryNode : public ParseTreeNode