ocfs2: remove custom swap functions in favor of built-in sort swap

The custom swap functions used in ocfs2 do not perform any special
operations and can be replaced with the built-in swap function of sort. 
This change not only reduces code size but also improves efficiency,
especially in scenarios where CONFIG_RETPOLINE is enabled, as it makes
indirect function calls more expensive.

By using the built-in swap, we avoid these costly indirect function calls,
leading to better performance.

Link: https://lkml.kernel.org/r/[email protected]
Signed-off-by: Kuan-Wei Chiu <[email protected]>
Reviewed-by: Joseph Qi <[email protected]>
Reviewed-by: Heming Zhao <[email protected]>
Cc: Ching-Chun (Jim) Huang <[email protected]>
Cc: Joel Becker <[email protected]>
Cc: Mark Fasheh <[email protected]>
Cc: Changwei Ge <[email protected]>
Cc: Gang He <[email protected]>
Cc: Jun Piao <[email protected]>
Cc: Junxiao Bi <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>

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