WL#2130: Table locking for stored FUNCTIONs

Collect all tables and SPs refered by a statement, and open all tables
with an implicit LOCK TABLES. Do find things refered by triggers and views,
we open them first (and then repeat this until nothing new is found), before
doing the actual lock tables.

mysql-test/t/sp-error.test

@@ -163,18 +163,9 @@ end loop bar|
 create procedure foo()
   return 42|
 
-# Doesn't allow queries in FUNCTIONs (for now :-( )
---error 1314
-create function foo() returns int
-begin
-  declare x int;
-  select max(c) into x from test.t;
-  return x;
-end|
-
 # Wrong number of arguments
 create procedure p(x int)
-  insert into test.t1 values (x)|
+  set @x = x|
 create function f(x int) returns int
   return x+42|
 
@@ -439,14 +430,6 @@ drop procedure bug1965|
 --error 1327
 select 1 into a|
 
-#
-# BUG#1654
-#
---error 1314
-create function bug1654()
-  returns int
-return (select sum(t.data) from test.t2 t)|
-
 #
 # BUG#1653
 #
@@ -475,7 +458,7 @@ drop table t3|
 create procedure bug2259()
 begin
   declare v1 int;
-  declare c1 cursor for select s1 from t10;
+  declare c1 cursor for select s1 from t1;
 
   fetch c1 into v1;
 end|
@@ -628,8 +611,10 @@ create procedure bug3294()
 begin
   declare continue handler for sqlexception drop table t5;
   drop table t5;
+  drop table t5;
 end|
 
+create table t5 (x int)|
 --error 1051
 call bug3294()|
 drop procedure bug3294|