arc: branch too far when STACK_CHECKING enabled.

A build error was resulting if CONFIG_ARC_STACK_CHECKING is enabled.
There is a breq that was too far. Adding conditional code to
re-arrange the branching so that it can be done.

See ZEP-1116.

Change-Id: Idea85817b2e05617bbaa4450437aa74c5737e213
Signed-off-by: Chuck Jordan <[email protected]>

Author: cjordan44

arch/arc/core/regular_irq.S

@@ -144,8 +144,16 @@ SECTION_FUNC(TEXT, _rirq_exit)
 
 	/* scheduler locked ? do not schedule */
 	ld_s r0, [r2, _thread_offset_to_sched_locked]
+#ifdef CONFIG_ARC_STACK_CHECKING
+	brle.d r0, 0,  _rirq_reschedule_check
+	ld sp, [r2, _thread_offset_to_sp]
+	b  _rirq_no_reschedule
+	/* This branch is a bit far */
+_rirq_reschedule_check:
+#else
 	brgt.d r0, 0,  _rirq_no_reschedule
 	ld sp, [r2, _thread_offset_to_sp]
+#endif
 
 	/* check if the current thread needs to be rescheduled */
 	push_s r2