target-mips: add SIGRIE instruction
Add SIGRIE (Signal Reserved Instruction Exception) for both MIPS and microMIPS. The instruction allows to use the 16-bit code field for software use. This instruction is introduced by and required as of Release 6. Signed-off-by: NYongbok Kim <yongbok.kim@imgtec.com> Reviewed-by: NLeon Alrae <leon.alrae@imgtec.com> Signed-off-by: NLeon Alrae <leon.alrae@imgtec.com>
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