powerpc/64s: save one more register in the masked interrupt handler

This frees up one more register (and takes advantage of that to
clean things up a little bit).

This register will be used in the following patch.

Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20210617155116.2167984-9-npiggin@gmail.com
This commit is contained in:
Nicholas Piggin 2021-06-18 01:51:07 +10:00 • committed by Michael Ellerman
commit 63e40806ee