glsl/opt_algebraic: Drop ~~x == x transformation.

No change on freedreno shader-db.

Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/21475>

src/compiler/glsl/opt_algebraic.cpp

@@ -305,11 +305,6 @@ ir_algebraic_visitor::handle_expression(ir_expression *ir)
       this->mem_ctx = ralloc_parent(ir);
 
    switch (ir->operation) {
-   case ir_unop_bit_not:
-      if (op_expr[0] && op_expr[0]->operation == ir_unop_bit_not)
-         return op_expr[0]->operands[0];
-      break;
-
    case ir_unop_abs:
       if (op_expr[0] == NULL)
 	 break;