fix usage of [] operator on pointer values; fix incorrect interpretation of []s as assembly style derefs in chained cases

src/eval/eval_ir.c

@@ -574,6 +574,7 @@ E_TYPE_ACCESS_FUNCTION_DEF(default)
           
           // rjf: ops to compute the final address
           new_tree = e_irtree_binary_op_u(arena, RDI_EvalOp_Add, offset_tree, base_tree);
+          mode = E_Mode_Offset;
         }
       }