my_alloc.c

- Changed 0x%lx -> %p
array.c:
- Static (preallocated) buffer can now be anywhere
my_sys.h
- Define MY_INIT_BUFFER_USED
sql_delete.cc & sql_lex.cc
- Use memroot when allocating classes (avoids call to current_thd)
sql_explain.h:
- Use preallocated buffers
sql_explain.cc:
- Use preallocated buffers and memroot
sql_select.cc:
- Use multi_alloc_root() instead of many alloc_root()
- Update calls to Explain

sql/sql_select.h

@@ -785,7 +785,7 @@ public:
   Information about a position of table within a join order. Used in join
   optimization.
 */
-typedef struct st_position :public Sql_alloc
+typedef struct st_position
 {
   /* The table that's put into join order */
   JOIN_TAB *table;