Revert "Modeler: Mark rem and remw as unreachable"

This reverts commit 59f5105.

src/unicorn/builder.rs

@@ -946,15 +946,13 @@ impl ModelBuilder {
             Instruction::And(rtype) => self.model_and(rtype),
             Instruction::Mul(rtype) => self.model_mul(rtype),
             Instruction::Div(_rtype) => self.model_unimplemented(inst),
-            Instruction::Rem(_rtype) => self.model_unimplemented(inst),
             Instruction::Divu(rtype) => self.model_divu(rtype),
             Instruction::Remu(rtype) => self.model_remu(rtype),
             Instruction::Addw(rtype) => self.model_addw(rtype),
             Instruction::Subw(rtype) => self.model_subw(rtype),
             Instruction::Sllw(_rtype) => self.model_unimplemented(inst),
             Instruction::Mulw(_rtype) => self.model_unimplemented(inst),
             Instruction::Divw(_rtype) => self.model_unimplemented(inst),
-            Instruction::Remw(_rtype) => self.model_unimplemented(inst),
             Instruction::Beq(btype) => self.model_beq(btype, &mut branch_true, &mut branch_false),
             Instruction::Bne(btype) => self.model_bne(btype, &mut branch_true, &mut branch_false),
             Instruction::Blt(btype) => self.model_blt(btype, &mut branch_true, &mut branch_false),