[XPU] Conditionally import CUDA-specific passes to avoid import errors on xpu platform (#21036)

Signed-off-by: chzhang <chaojun.zhang@intel.com>

vllm/compilation/pass_manager.py

@@ -5,12 +5,15 @@ from torch import fx as fx
 
 from vllm.config import VllmConfig
 from vllm.logger import init_logger
+from vllm.platforms import current_platform
+
+if current_platform.is_cuda_alike():
+    from .fusion import FusionPass
+    from .collective_fusion import AllReduceFusionPass, AsyncTPPass
+    from .fusion_attn import AttnFusionPass
 
 from .activation_quant_fusion import ActivationQuantFusionPass
-from .collective_fusion import AllReduceFusionPass, AsyncTPPass
 from .fix_functionalization import FixFunctionalizationPass
-from .fusion import FusionPass
-from .fusion_attn import AttnFusionPass
 from .inductor_pass import CustomGraphPass, InductorPass, get_pass_context
 from .noop_elimination import NoOpEliminationPass
 from .sequence_parallelism import SequenceParallelismPass