glsl/opt_algebraic: Drop the eq/neq add-removal optimization.

No change on freedreno or r300 shader-db.

Acked-by: Timothy Arceri <tarceri@itsqueeze.com>
Reviewed-by: Marek Olšák <marek.olsak@amd.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/21475>

src/compiler/glsl/opt_algebraic.cpp

@@ -449,39 +449,6 @@ ir_algebraic_visitor::handle_expression(ir_expression *ir)
       }
       break;
 
-   case ir_binop_equal:
-   case ir_binop_nequal:
-      for (int add_pos = 0; add_pos < 2; add_pos++) {
-         ir_expression *add = op_expr[add_pos];
-
-         if (!add || add->operation != ir_binop_add)
-            continue;
-
-         ir_constant *zero = op_const[1 - add_pos];
-         if (!is_vec_zero(zero))
-            continue;
-
-         /* We are allowed to add scalars with a vector or matrix. In that
-          * case lets just exit early.
-          */
-         if (add->operands[0]->type != add->operands[1]->type)
-            continue;
-
-         /* Depending of the zero position we want to optimize
-          * (0 cmp x+y) into (-x cmp y) or (x+y cmp 0) into (x cmp -y)
-          */
-         if (add_pos == 1) {
-            return new(mem_ctx) ir_expression(ir->operation,
-                                              neg(add->operands[0]),
-                                              add->operands[1]);
-         } else {
-            return new(mem_ctx) ir_expression(ir->operation,
-                                              add->operands[0],
-                                              neg(add->operands[1]));
-         }
-      }
-      break;
-
    case ir_binop_min:
    case ir_binop_max:
       if (!ir->type->is_float())