Vanilla cleanups and refactorings

Dead code cleanup:

part_info->num_parts usage was wrong and working incorrectly in
mysql_drop_partitions() because num_parts is already updated in
prep_alter_part_table(). We don't have to update part_info->partitions
because part_info is destroyed at alter_partition_lock_handling().

Cleanups:

- DBUG_EVALUATE_IF() macro replaced by shorter form DBUG_IF();
- Typo in ER_KEY_COLUMN_DOES_NOT_EXITS.

Refactorings:

- Splitted write_log_replace_delete_frm() into write_log_delete_frm()
  and write_log_replace_frm();
- partition_info via DDL_LOG_STATE;
- set_part_info_exec_log_entry() removed.

DBUG_EVALUATE removed

DBUG_EVALUTATE was only added for consistency together with
DBUG_EVALUATE_IF. It is not used anywhere in the code.

DBUG_SUICIDE() fix on release build

On release DBUG_SUICIDE() was statement. It was wrong as
DBUG_SUICIDE() is used in expression context.

include/mysql.h

@@ -140,6 +140,8 @@ typedef unsigned long long my_ulonglong;
 #define ER_WRONG_FK_OPTION_FOR_VIRTUAL_COLUMN ER_WRONG_FK_OPTION_FOR_GENERATED_COLUMN
 #define ER_UNSUPPORTED_ACTION_ON_VIRTUAL_COLUMN ER_UNSUPPORTED_ACTION_ON_GENERATED_COLUMN
 #define ER_UNSUPPORTED_ENGINE_FOR_VIRTUAL_COLUMNS ER_UNSUPPORTED_ENGINE_FOR_GENERATED_COLUMNS
+#define ER_KEY_COLUMN_DOES_NOT_EXITS ER_KEY_COLUMN_DOES_NOT_EXIST
+#define ER_DROP_PARTITION_NON_EXISTENT ER_PARTITION_DOES_NOT_EXIST
 
 typedef struct st_mysql_rows {
   struct st_mysql_rows *next;		/* list of rows */