powerpc/kprobes: Don't save/restore DAR/DSISR to/from pt_regs for optprobes
We don't save/restore these across a trap, or with KPROBES_ON_FTRACE. Signed-off-by: NNaveen N. Rao <naveen.n.rao@linux.vnet.ibm.com> Signed-off-by: NMichael Ellerman <mpe@ellerman.id.au>
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