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H A Dtranslate.ca11e3a15 Mon Aug 07 22:11:13 CDT 2023 Nicholas Piggin <npiggin@gmail.com> target/ppc: Suppress single step interrupts on rfi-type instructions

BookS does not take single step interrupts on completion of rfi and
similar (rfid, hrfid, rfscv). This is not a completely clean way to
do it, but in general non-branch instructions that change NIP on
completion are excluded.

Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Cédric Le Goater <clg@kaod.org>