alpha: irq clean up

Stop touching irq_desc[irq] directly, instead use accessor
functions provided. Use irq_has_action instead of directly
testing the irq_desc.

Tested-by: Michael Cree <mcree@orcon.net.nz>
Signed-off-by: Kyle McMartin <kyle@redhat.com>
Signed-off-by: Matt Turner <mattst88@gmail.com>

diff --cc arch/alpha/kernel/irq.c
Simple merge

diff --cc arch/alpha/kernel/irq_alpha.c
Simple merge

diff --cc arch/alpha/kernel/irq_i8259.c
Simple merge

diff --cc arch/alpha/kernel/irq_pyxis.c
Simple merge

diff --cc arch/alpha/kernel/irq_srm.c
Simple merge

diff --cc arch/alpha/kernel/sys_alcor.c
Simple merge

diff --cc arch/alpha/kernel/sys_cabriolet.c
Simple merge

diff --cc arch/alpha/kernel/sys_dp264.c
Simple merge

diff --cc arch/alpha/kernel/sys_eb64p.c
Simple merge

diff --cc arch/alpha/kernel/sys_eiger.c
Simple merge

diff --cc arch/alpha/kernel/sys_jensen.c
Simple merge

diff --cc arch/alpha/kernel/sys_marvel.c
Simple merge

diff --cc arch/alpha/kernel/sys_mikasa.c
Simple merge

diff --cc arch/alpha/kernel/sys_noritake.c
Simple merge

diff --cc arch/alpha/kernel/sys_rawhide.c
Simple merge

diff --cc arch/alpha/kernel/sys_rx164.c
Simple merge

diff --cc arch/alpha/kernel/sys_sable.c
Simple merge

diff --cc arch/alpha/kernel/sys_takara.c
Simple merge

diff --cc arch/alpha/kernel/sys_titan.c
Simple merge

diff --cc arch/alpha/kernel/sys_wildfire.c
Simple merge