Implement BR, BLR and RET. This is all of the 'unconditional
branch (register)' instruction category except for ERET
and DPRS (which are system mode only).
Signed-off-by: NAlexander Graf <agraf@suse.de>
[claudio: reimplemented on top of new decoder structure]
Signed-off-by: NClaudio Fontana <claudio.fontana@linaro.org>
Signed-off-by: NPeter Maydell <peter.maydell@linaro.org>
Reviewed-by: NRichard Henderson <rth@twiddle.net>