glsl/opt_algebraic: Drop csel(true/false, x, y) optimization.

No change on freedreno 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

@@ -646,13 +646,6 @@ ir_algebraic_visitor::handle_expression(ir_expression *ir)
       }
       break;
 
-   case ir_triop_csel:
-      if (is_vec_one(op_const[0]))
-	 return ir->operands[1];
-      if (is_vec_zero(op_const[0]))
-	 return ir->operands[2];
-      break;
-
    /* Remove interpolateAt* instructions for demoted inputs. They are
     * assigned a constant expression to facilitate this.
     */