[Qwen-moe] Remove the minor operation arange (#2373)

### What this PR does / why we need it?
Integrate the arange operator to reduce the time spent and improve
performance

### Does this PR introduce _any_ user-facing change?
No

### How was this patch tested?

- vLLM version: v0.10.1.1
- vLLM main:
56dcf4e7e9

---------

Signed-off-by: s30076806 <songjiayang2@h-partners.com>

tests/ut/quantization/test_w8a8_dynamic.py

@@ -55,6 +55,12 @@ class TestAscendW8A8FusedMoEMethod(TestBase):
             torch.randn(self.num_tokens),
         )
         mock_moe_finalize_routing.return_value = self.placeholder
+        row_idx_len = self.num_tokens * 8
+        row_idx = (torch.arange(
+            0,
+            row_idx_len,
+            dtype=torch.int32,
+        ).view(8, -1).permute(1, 0).contiguous())
 
         result = fused_experts_with_all2all(
             hidden_states=self.placeholder,
@@ -64,6 +70,7 @@ class TestAscendW8A8FusedMoEMethod(TestBase):
             w2_scale=self.placeholder,
             topk_weights=self.placeholder,
             topk_ids=self.placeholder,
+            row_idx=row_idx,
             top_k=8,
             expert_map=expert_map,
             ep_group=ep_group,