[refer #4197]] Remove dummy field

Author: knizhnik

pg_query_state.h

@@ -52,7 +52,6 @@ typedef struct
 	PG_QS_RequestResult	result_code;
 	int		warnings;						/* bitmap of warnings */
 	int		stack_depth;
-	char  filler[1024*1024];
 	char	stack[FLEXIBLE_ARRAY_MEMBER];	/* sequencially laid out stack frames in form of
 												text records */
 } shm_mq_msg;