PPC: No exception handling in RZIL

[Rot127]

Is your feature request related to a problem? Please describe.

The PPC RZIL code doesn't implement exception handling although there is a least the MTSPR/MFSPR and INVALID instruction which could potentially use it.

See: https://github.com/Rot127/rizin/blob/0b8c56c5764c586139b192b846346de1d86eedee/librz/analysis/arch/ppc/ppc_il_ops.c#L807

Describe the solution you'd like

Implement exception handling.

Describe alternatives you've considered

None

Additional context

None