Bignums from garbage-collect, memory-use-counts

Bignums from garbage-collect, memory-use-counts

Do not limit the results of garbage-collect and memory-use-counts
to fixnums, as they might be bignums now on 32-bit hosts.
* src/lisp.h (byte_ct): New type.
* src/alloc.c (object_ct): New type.
(consing_since_gc, gc_relative_threshold)
(memory_full_cons_threshold, total_string_bytes):
Now byte_ct, not EMACS_INT.
(total_conses, total_symbols, total_buffers, total_free_conses)
(total_free_symbols, total_free_floats, total_floats)
(total_free_intervals, total_intervals, total_strings)
(total_free_strings, total_vectors, total_vector_slots)
(total_free_vector_slots): Now object_ct, not EMACS_INT.
(bounded_number): Remove.  All uses removed.
(object_bytes): New function.
(total_bytes_of_live_objects, garbage_collect_1): Use byte_ct,
not size_t, to count total GC bytes where multiple objects are
involved.
(garbage_collect_1, Fmemory_use_counts):
Do not limit returned counts to fixnums.
(sweep_conses, sweep_floats, sweep_intervals, sweep_symbols):
Use object_ct, not EMACS_INT, to count GC objects.