Revert "sched, x86: Optimize branch hint in __switch_to()"

This reverts commit a3a1de0c.

Commit 8ec6993d cleared the es
and ds selectors, so the original branch hints are correct now.
Therefore the branch hint doesn't need to be removed.
Signed-off-by: NTim Blechmann <tim@klingt.org>
LKML-Reference: <4B16503A.8030508@klingt.org>
Signed-off-by: NIngo Molnar <mingo@elte.hu>

arch/x86/kernel/process_64.c

@@ -406,10 +406,11 @@ __switch_to(struct task_struct *prev_p, struct task_struct *next_p)
 	 * This won't pick up thread selector changes, but I guess that is ok.
 	 */
 	savesegment(es, prev->es);
-	if (next->es | prev->es)
+	if (unlikely(next->es | prev->es))
 		loadsegment(es, next->es);
+
 	savesegment(ds, prev->ds);
-	if (next->ds | prev->ds)
+	if (unlikely(next->ds | prev->ds))
 		loadsegment(ds, next->ds);