Fix limit_rows_examined.test:

- Take into account that Dynamic_array::back() now returns 
  pointer to the last element (it used to return pointer to 
  right after the last element)
- Fix error messages merge: ER_INTERNAL_ERROR was defined 
  independently by both mysql-5.6 and mariadb-5.5. Switch 
  to their error number, and still support ours for compatibility.

sql/share/errmsg-utf8.txt

@@ -7098,6 +7098,8 @@ ER_VIEW_ORDERBY_IGNORED
         eng "View '%-.192s'.'%-.192s' ORDER BY clause ignored because there is other ORDER BY clause already."
 ER_CONNECTION_KILLED 70100 
         eng "Connection was killed"
+ER_UNSED 
+        eng "Internal error: '%-.192s'"
 ER_INSIDE_TRANSACTION_PREVENTS_SWITCH_SKIP_REPLICATION
         eng "Cannot modify @@session.skip_replication inside a transaction"
 ER_STORED_FUNCTION_PREVENTS_SWITCH_SKIP_REPLICATION

sql/sp_head.cc

@@ -975,7 +975,7 @@ subst_spvars(THD *thd, sp_instr *instr, LEX_STRING *query_str)
   thd->query_name_consts= 0;
 
   for (Item_splocal **splocal= sp_vars_uses.front(); 
-       splocal < sp_vars_uses.back(); splocal++)
+       splocal <= sp_vars_uses.back(); splocal++)
   {
     Item *val;