Skip some tests on Blackwell (#9777)

Signed-off-by: Hao Lu <14827759+hlu1@users.noreply.github.com>

sgl-kernel/tests/test_int8_gemm.py

@@ -1,6 +1,7 @@
 import pytest
 import torch
 from sgl_kernel import int8_scaled_mm
+from utils import is_sm10x
 
 
 def to_int8(tensor: torch.Tensor) -> torch.Tensor:
@@ -30,6 +31,10 @@ def _test_accuracy_once(M, N, K, with_bias, out_dtype, device):
     torch.testing.assert_close(o, o1)
 
 
+@pytest.mark.skipif(
+    is_sm10x(),
+    reason="int8_scaled_mm is only supported on sm90 and lower",
+)
 @pytest.mark.parametrize("M", [1, 16, 32, 64, 128, 512, 1024, 4096, 8192])
 @pytest.mark.parametrize("N", [16, 128, 512, 1024, 4096, 8192, 16384])
 @pytest.mark.parametrize("K", [512, 1024, 4096, 8192, 16384])