Change position of field "transformed" in struct CreateStatsStmt.

Resolve the disagreement with nodes/*funcs.c field order in favor of the
latter, which is better-aligned with the IndexStmt field order.  This
field is new in v14.

Discussion: https://postgr.es/m/20210611045546.GA573364@rfd.leadboat.com

src/backend/parser/parse_utilcmd.c

@@ -1980,8 +1980,8 @@ generateClonedExtStatsStmt(RangeVar *heapRel, Oid heapRelid,
 	stats->exprs = def_names;
 	stats->relations = list_make1(heapRel);
 	stats->stxcomment = NULL;
-	stats->if_not_exists = false;
 	stats->transformed = true;	/* don't need transformStatsStmt again */
+	stats->if_not_exists = false;
 
 	/* Clean up */
 	ReleaseSysCache(ht_stats);

src/include/nodes/parsenodes.h

@@ -2912,8 +2912,8 @@ typedef struct CreateStatsStmt
 	List	   *exprs;			/* expressions to build statistics on */
 	List	   *relations;		/* rels to build stats on (list of RangeVar) */
 	char	   *stxcomment;		/* comment to apply to stats, or NULL */
-	bool		if_not_exists;	/* do nothing if stats name already exists */
 	bool		transformed;	/* true when transformStatsStmt is finished */
+	bool		if_not_exists;	/* do nothing if stats name already exists */
 } CreateStatsStmt;
 
 /*