arm64: entry: factor irq triage logic into macros

In subsequent patches we'll allow an FIQ handler to be registered, and
FIQ exceptions will need to be triaged very similarly to IRQ exceptions.
So that we can reuse the existing logic, this patch factors the IRQ
triage logic out into macros that can be reused for FIQ.

The macros are named to follow the elX_foo_handler scheme used by the C
exception handlers. For consistency with other top-level exception
handlers, the kernel_entry/kernel_exit logic is not moved into the
macros. As FIQ will use a different C handler, this handler name is
provided as an argument to the macros.

There should be no functional change as a result of this patch.

Signed-off-by: Marc Zyngier <[email protected]>
[Mark: rework macros, commit message, rebase before DAIF rework]
Signed-off-by: Mark Rutland <[email protected]>
Tested-by: Hector Martin <[email protected]>
Cc: James Morse <[email protected]>
Cc: Thomas Gleixner <[email protected]>
Cc: Will Deacon <[email protected]>
Acked-by: Will Deacon <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Catalin Marinas <[email protected]>

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