hle: Eliminate need to specify command headers for IPC. (#6678)

src/core/hle/kernel/hle_ipc.h

@@ -207,6 +207,11 @@ public:
         return cmd_buf.data();
     }
 
+    /// Returns the command header from the IPC command buffer.
+    IPC::Header CommandHeader() const {
+        return {cmd_buf[0]};
+    }
+
     /**
      * Returns the session through which this request was made. This can be used as a map key to
      * access per-client data on services.

src/core/hle/kernel/ipc_debugger/recorder.cpp

@@ -100,7 +100,7 @@ void Recorder::SetRequestInfo(const std::shared_ptr<Kernel::Thread>& client_thre
 
         record.function_name = std::dynamic_pointer_cast<Service::ServiceFrameworkBase>(
                                    client_session->parent->port->GetServerPort()->hle_handler)
-                                   ->GetFunctionName(record.untranslated_request_cmdbuf[0]);
+                                   ->GetFunctionName({record.untranslated_request_cmdbuf[0]});
     }
     client_session_map.erase(thread_id);