arena_run_dalloc
arena_run_dalloc(arena, (arena_run_t *)((uintptr_t)chunk + (pageind <<
arena_run_dalloc(arena, run, bin->run_size);
arena_run_dalloc(arena, (arena_run_t *)ptr, size);
static void arena_run_dalloc(arena_t *arena, arena_run_t *run, size_t size);