Function zone_size

3rd/mimalloc-2.0.9/src/alloc-override-osx.c:44–48

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static size_t zone_size(malloc_zone_t* zone, const void* p) {
  MI_UNUSED(zone);
  if (!mi_is_in_heap_region(p)){ return 0; } // not our pointer, bail out
  return mi_usable_size(p);
}

static void* zone_malloc(malloc_zone_t* zone, size_t size) {
  MI_UNUSED(zone);