ARM: 9320/1: fix stack depot IRQ stack filter

Place IRQ handlers such as gic_handle_irq() in the irqentry section even
if FUNCTION_GRAPH_TRACER is not enabled.  Without this, the stack
depot's filter_irq_stacks() does not correctly filter out IRQ stacks in
those configurations, which hampers deduplication and eventually leads
to "Stack depot reached limit capacity" splats with KASAN.

A similar fix was done for arm64 in commit f679495
("arm64: set __exception_irq_entry with __irq_entry as a default").

Link: https://lore.kernel.org/r/[email protected]

Signed-off-by: Vincent Whitchurch <[email protected]>
Signed-off-by: Russell King (Oracle) <[email protected]>

arch/arm/include/asm/exception.h

@@ -10,10 +10,6 @@
 
 #include <linux/interrupt.h>
 
-#ifdef CONFIG_FUNCTION_GRAPH_TRACER
 #define __exception_irq_entry	__irq_entry
-#else
-#define __exception_irq_entry
-#endif
 
 #endif /* __ASM_ARM_EXCEPTION_H */