powerpc/irq: Move #ifdef'ed body of do_IRQ() into a separate function
Rather than a giant ifdef in the body of do_IRQ(), including a dangling else, move the irq stack logic into a separate routine and do the ifdef there. Signed-off-by: NMichael Ellerman <michael@ellerman.id.au> Signed-off-by: NBenjamin Herrenschmidt <benh@kernel.crashing.org>
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