fix dret decoder
Created by: Phantom1003
from https://github.com/openhwgroup/cva6/issues/899, this patch passed the testcase in the report. debug mode check reset the illegal_instr signal, use its previous value instead of 0.
Created by: Phantom1003
from https://github.com/openhwgroup/cva6/issues/899, this patch passed the testcase in the report. debug mode check reset the illegal_instr signal, use its previous value instead of 0.
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