glsl: Use 'using' to be explicit about visitor overloads

From Kristian Hoegsberg
e3dfa8f4d694e7d64a6401752af1f973b0852aab in mainline Mesa

reduces clang warnings

lib/mesa/src/compiler/glsl/linker.cpp

@@ -260,6 +260,8 @@ public:
 
 class array_resize_visitor : public deref_type_updater {
 public:
+   using deref_type_updater::visit;
+
    unsigned num_vertices;
    gl_shader_program *prog;
    gl_shader_stage stage;
@@ -1506,6 +1508,8 @@ move_non_declarations(exec_list *instructions, exec_node *last,
  */
 class array_sizing_visitor : public deref_type_updater {
 public:
+   using deref_type_updater::visit;
+
    array_sizing_visitor()
       : mem_ctx(ralloc_context(NULL)),
         unnamed_interfaces(_mesa_pointer_hash_table_create(NULL))

lib/mesa/src/compiler/glsl/lower_jumps.cpp

@@ -268,6 +268,8 @@ struct ir_lower_jumps_visitor : public ir_control_flow_visitor {
     * contains the jump.
     */
 
+   using ir_control_flow_visitor::visit;
+
    bool progress;
 
    struct function_record function;

lib/mesa/src/compiler/glsl/opt_constant_variable.cpp

@@ -49,6 +49,9 @@ struct assignment_entry {
 
 class ir_constant_variable_visitor : public ir_hierarchical_visitor {
 public:
+   using ir_hierarchical_visitor::visit;
+   using ir_hierarchical_visitor::visit_enter;
+
    virtual ir_visitor_status visit_enter(ir_dereference_variable *);
    virtual ir_visitor_status visit(ir_variable *);
    virtual ir_visitor_status visit_enter(ir_assignment *);

lib/mesa/src/compiler/glsl/opt_dead_code_local.cpp

@@ -66,6 +66,8 @@ public:
 
 class kill_for_derefs_visitor : public ir_hierarchical_visitor {
 public:
+   using ir_hierarchical_visitor::visit;
+
    kill_for_derefs_visitor(exec_list *assignments)
    {
       this->assignments = assignments;