* utils.c (do_value_free): New function.
(make_cleanup_value_free): Likewise.
* dwarf2loc.c (dwarf2_evaluate_loc_desc_full): Handle value
freeing correctly.
(dwarf2_loc_desc_needs_frame): Call
make_cleanup_value_free_to_mark.
* dwarf2expr.h (struct dwarf_expr_context) <mark>: Remove field.
* dwarf2expr.c (free_dwarf_expr_context): Don't call
value_free_to_mark.
(new_dwarf_expr_context): Don't call value_mark.
* dwarf2-frame.c (execute_stack_op): Call
make_cleanup_value_free_to_mark.
* defs.h (make_cleanup_value_free): Declare.