parameter of my_yyoverflow made independed from YYSIZE_T (BUG#4204)

sql/sql_parse.cc:
  parameter of my_yyoverflow made independed from YYSIZE_T
sql/sql_yacc.yy:
  parameter of my_yyoverflow made independed from YYSIZE_T

sql/sql_parse.cc

@@ -2330,10 +2330,10 @@ bool check_stack_overrun(THD *thd,char *buf __attribute__((unused)))
 #define MY_YACC_INIT 1000			// Start with big alloc
 #define MY_YACC_MAX  32000			// Because of 'short'
 
-bool my_yyoverflow(short **yyss, YYSTYPE **yyvs, int *yystacksize)
+bool my_yyoverflow(short **yyss, YYSTYPE **yyvs, ulong *yystacksize)
 {
   LEX	*lex=current_lex;
-  int  old_info=0;
+  ulong old_info=0;
   if ((uint) *yystacksize >= MY_YACC_MAX)
     return 1;
   if (!lex->yacc_yyvs)

sql/sql_yacc.yy

@@ -30,7 +30,7 @@
 extern void yyerror(const char*);
 int yylex(void *yylval);
 
-#define yyoverflow(A,B,C,D,E,F) if (my_yyoverflow((B),(D),(int*) (F))) { yyerror((char*) (A)); return 2; }
+#define yyoverflow(A,B,C,D,E,F) {ulong val= *(F); if(my_yyoverflow((B), (D), &val)) { yyerror((char*) (A)); return 2; } else { *(F)= (YYSIZE_T)val; }}
 
 inline Item *or_or_concat(Item* A, Item* B)
 {
@@ -65,7 +65,7 @@ inline Item *or_or_concat(Item* A, Item* B)
 }
 
 %{
-bool my_yyoverflow(short **a, YYSTYPE **b,int *yystacksize);
+bool my_yyoverflow(short **a, YYSTYPE **b, ulong *yystacksize);
 %}
 
 %pure_parser					/* We have threads */