fixes #2460: better alias detection esp. for macOS

docs/changes.txt

@@ -11,6 +11,7 @@
 ## Bugs
 ##
 
+- Fixed alias detection with additional processor core count check
 - Fixed maximum password length in modules of hash-modes 600, 7800, 7801 and 9900
 - Fixed uninitialized value in bitsliced DES kernel (BF mode only) leading to false negatives
 

src/backend.c

@@ -47,6 +47,10 @@ static bool is_same_device (const hc_device_param_t *src, const hc_device_param_
 
   if (src->opencl_device_type != dst->opencl_device_type) return false;
 
+  // macOS still can't distinguish the devices by PCIe bus:
+
+  if (src->device_processors != dst->device_processors) return false;
+
   return true;
 }