detect variable length array in upper bound and lower bound

src/dwarf/dwarf_parse.h

@@ -317,7 +317,7 @@ typedef struct DW_PubStringsTable
 typedef struct DW_Reference
 {
   DW_CompUnit *cu;
-  U64          info_off;
+  U64          info_off; // global .debug_info offset
 } DW_Reference;
 
 ////////////////////////////////
@@ -521,6 +521,8 @@ internal DW_Reference  dw_ref_from_tag_attrib_kind       (DW_Input *input, DW_Co
 internal DW_LocList    dw_loclist_from_tag_attrib_kind   (Arena *arena, DW_Input *input, DW_CompUnit *cu, DW_Tag tag, DW_AttribKind kind);
 internal Rng1U64List   dw_rnglist_from_tag_attrib_kind   (Arena *arena, DW_Input *input, DW_CompUnit *cu, DW_Tag tag, DW_AttribKind kind);
 
+internal B32 dw_is_attrib_var_ref(DW_Input *input, DW_CompUnit *cu, DW_Attrib *attrib);
+
 // compile unit
 
 internal DW_CompUnit  dw_cu_from_info_off(Arena *arena, DW_Input *input, DW_ListUnitInput lu_input, U64 offset, B32 relaxed);