`--ust-trace` outputs bad addresses when compiled with rv32imc

When compiled  `--with-isa=RV32IMC`
``` 
VALID,ADDRESS,INSN,PRIVILEGE,EXCEPTION,ECAUSE,TVAL,INTERRUPT
1,ffffffff80000000,4081,3,0,0,0,0
1,ffffffff80000002,4101,3,0,0,0,0
[...] 
```

but when compiled  `--with-isa=RV64IMC`
```
VALID,ADDRESS,INSN,PRIVILEGE,EXCEPTION,ECAUSE,TVAL,INTERRUPT
1,80000000,4081,3,0,0,0,0
1,80000002,4101,3,0,0,0,0
[...] 
```
