Revert "sras: remove redundant conditions"

This reverts commit 594e3bd6.

src/frontend/sras.sv

@@ -71,7 +71,7 @@ module sras #(
                 if (ovf_counter_q[ptr_spec_q] != '0) begin
                     ovf_counter_d[ptr_spec_d] = ovf_counter_q[ptr_spec_q] - 1'b1;
                 end
-            end else if (begin_spec_i) begin
+            end else if (!bad_spec_i && begin_spec_i) begin
                 ovf_counter_d[ptr_spec_d] = ovf_counter_q[ptr_spec_q];
             end
         end
@@ -94,7 +94,7 @@ module sras #(
                 if (ovf_counter_q[ptr_spec_q] == '0) begin
                     tos_d[ptr_spec_d] = prev_minus_one;
                 end
-            end else if (begin_spec_i) begin
+            end else if (!bad_spec_i && begin_spec_i) begin
                 tos_d[ptr_spec_d] = tos_q[ptr_spec_q];
             end
         end