nir: add variable field from_ssbo_unsized_array

This will be used for validation in following patches

Acked-by: Marek Olšák <marek.olsak@amd.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/28538>

src/compiler/glsl/glsl_to_nir.cpp

@@ -445,6 +445,7 @@ nir_visitor::visit(ir_variable *ir)
    var->data.used = ir->data.used;
    var->data.max_array_access = ir->data.max_array_access;
    var->data.implicit_sized_array = ir->data.implicit_sized_array;
+   var->data.from_ssbo_unsized_array = ir->data.from_ssbo_unsized_array;
 
    switch(ir->data.mode) {
    case ir_var_auto:

src/compiler/nir/nir.h

@@ -656,6 +656,11 @@ typedef struct nir_variable {
        */
       unsigned from_named_ifc_block : 1;
 
+      /**
+       * Unsized array buffer variable.
+       */
+      unsigned from_ssbo_unsized_array : 1;
+
       /**
        * Non-zero if the variable must be a shader input. This is useful for
        * constraints on function parameters.