target-arm: A64: add support for BR, BLR and RET insns
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>
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