structs: recycle IDs of dead struct types.

* struct.c (nelem): New macro.
(struct struct_id_recycle): New struct type.
(struct_id_counter): Initialize to 1 instead of zero.
(get_struct_id, recycle_struct_id): New static functions.
(struct_type_finalize): From each slot symbol, remove the
struct type's ID from it slot cache, and finally recycle the
struct type ID.
(make_struct_type): Use get_struct_id to obtain an ID for the
new struct type, rather than directly incrementing the global
counter.

0 files changed, 0 insertions, 0 deletions