[PATCH v2] irqchip/gic: Fix UBSAN shift-out-of-bounds in GIC helpers

[朱领]

> gic_{poke,peek}_irq in drivers/irqchip/irq-gic.c have a similar
> pattern.
>
> Mind fixing them as well?

Yes, thanks for pointing this out. I have fixed both helpers and will
send v3 shortly.

Thanks,
Zhu Ling

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