[PowerPC] Test power9-specific code
This patch enables testing power9-specific code by install updated version of qemu from Debian bullseye-backports. It also fixes a bug in poly1305-internal.asm affecting big-endian mode.
This patch enables testing power9-specific code by install updated version of qemu from Debian bullseye-backports. It also fixes a bug in poly1305-internal.asm affecting big-endian mode.