glsl: allow AoA to be sized by initializer or constructor

V2: Split out unsized array validation to its own patch as
suggested by Samuel.

Reviewed-by: Samuel Iglesias Gonsálvez <siglesias@igalia.com>

src/glsl/ast_array_index.cpp

@@ -28,13 +28,10 @@
 void
 ast_array_specifier::print(void) const
 {
-   if (this->is_unsized_array) {
-      printf("[ ] ");
-   }
-
    foreach_list_typed (ast_node, array_dimension, link, &this->array_dimensions) {
       printf("[ ");
-      array_dimension->print();
+      if (((ast_expression*)array_dimension)->oper != ast_unsized_array_dim)
+         array_dimension->print();
       printf("] ");
    }
 }