glsl: ir_texture add clamp field

For ARB_sparse_texture_clamp to hold the lodClamp parameter.

Reviewed-by: Marek Olšák <marek.olsak@amd.com>
Signed-off-by: Qiang Yu <yuq825@gmail.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/14488>

src/compiler/glsl/ir_print_visitor.cpp

@@ -349,6 +349,15 @@ void ir_print_visitor::visit(ir_texture *ir)
       }
    }
 
+   if (ir->op == ir_tex || ir->op == ir_txb || ir->op == ir_txd) {
+      if (ir->clamp) {
+         fprintf(f, " ");
+         ir->clamp->accept(this);
+      } else {
+         fprintf(f, " ()");
+      }
+   }
+
    fprintf(f, " ");
    switch (ir->op)
    {