Exempt IPEX from non_blocking previews fixing segmentation faults. (#3708)

comfy/model_management.py

@@ -659,6 +659,8 @@ def supports_cast(device, dtype): #TODO
 def device_supports_non_blocking(device):
     if is_device_mps(device):
         return False #pytorch bug? mps doesn't support non blocking
+    if is_intel_xpu():
+        return False
     if args.deterministic: #TODO: figure out why deterministic breaks non blocking from gpu to cpu (previews)
         return False
     if directml_enabled: