glsl/opt_algebraic: Drop f2i(trunc(x)) -> f2i(x) 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

@@ -305,15 +305,6 @@ ir_algebraic_visitor::handle_expression(ir_expression *ir)
       this->mem_ctx = ralloc_parent(ir);
 
    switch (ir->operation) {
-   case ir_unop_f2i:
-   case ir_unop_f2u:
-      if (op_expr[0] && op_expr[0]->operation == ir_unop_trunc) {
-         return new(mem_ctx) ir_expression(ir->operation,
-                                           ir->type,
-                                           op_expr[0]->operands[0]);
-      }
-      break;
-
    case ir_unop_saturate:
       if (op_expr[0] && op_expr[0]->operation == ir_binop_add) {
          ir_expression *b2f_0 = op_expr[0]->operands[0]->as_expression();