Suppress GC stats when obviously not needed
This should help future improvements where these stats can be bignums that do not fit into intmax_t. * src/alloc.c (struct gcstat, gcstat): New type and static var, to package up GC statistics into one C object. It replaces ... (total_free_intervals, total_intervals, total_strings) (total_free_strings, total_string_bytes, total_vectors) (total_vector_slots, total_free_vector_slots): ... these removed static vars. All uses changed. (garbage_collect_1): Accept a struct gcstat *, not a void * which was not used anymore anyway. Return a bool indicating success, instead of a Lisp object. All callers changed. (garbage_collect): New function. All C callers of Fgarbage_collect changed to use it, since none of them use the return value. Now, only Lisp code uses Fgarbage_collect. (Fgarbage_collect): No longer noinline. Cons up the return value here, not in garbage_collect_1.
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