Added missing INSTR_R4 option in 'switch (S->riscv->P.EX.format)' in riscvstep function.
Added missing INSTR_R4 option in 'switch (S->riscv->P.EX.format)' in riscvstep function.

phillipstanleymarbell/sunflower-simulator,phillipstanleymarbell/sunflower-simulator,gemusehaken/sunflower-simulator,gemusehaken/sunflower-simulator,phillipstanleymarbell/sunflower-simulator,phillipstanleymarbell/sunflower-simulator,phillipstanleymarbell/sunflower-simulator,gemusehaken/sunflower-simulator,gemusehaken/sunflower-simulator,gemusehaken/sunflower-simulator,gemusehaken/sunflower-simulator,gemusehaken/sunflower-simulator,phillipstanleymarbell/sunflower-simulator,gemusehaken/sunflower-simulator,phillipstanleymarbell/sunflower-simulator,phillipstanleymarbell/sunflower-simulator