try to allocate within our hint space (partially addresses issue #360)

Author: daanx

src/os.c

@@ -585,7 +585,7 @@ static mi_decl_cache_align _Atomic(uintptr_t) aligned_base;
 static void* mi_os_get_aligned_hint(size_t try_alignment, size_t size) 
 {
   if (try_alignment == 0 || try_alignment > MI_SEGMENT_SIZE) return NULL;
-  if ((size%MI_SEGMENT_SIZE) != 0) return NULL;
+  size = _mi_align_up(size, MI_SEGMENT_SIZE);
   if (size > 1*MI_GiB) return NULL;  // guarantee the chance of fixed valid address is at most 1/(KK_HINT_AREA / 1<<30) = 1/4096.
   #if (MI_SECURE>0)
   size += MI_SEGMENT_SIZE;        // put in `MI_SEGMENT_SIZE` virtual gaps between hinted blocks; this splits VLA's but increases guarded areas.