nir: add max_array_access data field

Will be used in following patches for glsl linking validation.

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

@@ -443,6 +443,7 @@ nir_visitor::visit(ir_variable *ir)
    var->data.from_named_ifc_block = ir->data.from_named_ifc_block;
    var->data.compact = false;
    var->data.used = ir->data.used;
+   var->data.max_array_access = ir->data.max_array_access;
 
    switch(ir->data.mode) {
    case ir_var_auto:

src/compiler/nir/nir.h

@@ -606,6 +606,13 @@ typedef struct nir_variable {
        */
       unsigned explicit_location : 1;
 
+      /**
+       * Highest element accessed with a constant array index
+       *
+       * Not used for non-array variables. -1 is never accessed.
+       */
+      int max_array_access;
+
       /**
        * Is this varying used by transform feedback?
        *