* alloc.c: #include "intervals.h".

* alloc.c: #include "intervals.h".
	(init_intervals, make_interval,
	mark_interval, mark_interval_tree): New functions conditionally
	defined.
	(make_uninit_string): Call INITIALIZE_INTERVAL.
	(INIT_INTERVALS, UNMARK_BALANCE_INTERVALS, MARK_INTERVAL_TREE):
	New macros, conditionally defined.
	(mark_object): Call MARK_INTERVAL_TREE in case Lisp_String.
	(gc_sweep): If text properties are in use, place all unmarked
	intervals on the free list.  Call UNMARK_BALANCE_INTERVALS on
	`buffer->intervals' when unmarking `buffer'.
	(compact_strings): Include INTERVAL_PTR_SIZE in calculation for
	target of bcopy when relocating strings.
	(init_alloc_once): Call INIT_INTERVALS.
	(make_pure_string): Include INTERVAL_PTR_SIZE in calculation of
	`size'.