Fixed BUG#7185: Stored procedure crash if identifier is AVG

mysql-test/r/sp.result:
  Added test case for BUG#7185.
mysql-test/t/sp.test:
  Added test case for BUG#7185.
sql/sql_yacc.yy:
  Allow non-reserved words as stored procedure names.

mysql-test/r/sp.result

@@ -2844,4 +2844,10 @@ drop procedure bug6900|
 drop procedure bug9074|
 drop procedure bug6900_9074|
 drop table t3|
+drop procedure if exists avg|
+create procedure avg ()
+begin
+end|
+call avg ()|
+drop procedure avg|
 drop table t1,t2;

mysql-test/t/sp.test

@@ -3481,6 +3481,20 @@ drop procedure bug6900_9074|
 drop table t3|
 
 
+#
+# BUG#7185: Stored procedure crash if identifier is AVG
+#
+--disable_warnings
+drop procedure if exists avg|
+--enable_warnings
+create procedure avg ()
+begin
+end|
+
+call avg ()|
+drop procedure avg|
+
+
 #
 # BUG#NNNN: New bug synopsis
 #

sql/sql_yacc.yy

@@ -1328,12 +1328,12 @@ clear_privileges:
         ;
 
 sp_name:
-	  IDENT_sys '.' IDENT_sys
+	  ident '.' ident
 	  {
 	    $$= new sp_name($1, $3);
 	    $$->init_qname(YYTHD);
 	  }
-	| IDENT_sys
+	| ident
 	  {
 	    $$= sp_name_current_db_new(YYTHD, $1);
 	  }