[Bugfix] Enforce contiguous input for dynamic_per_token FP8/INT8 quant (#19452)

Signed-off-by: mgoin <mgoin64@gmail.com>

Author: mgoin

vllm/_custom_ops.py

@@ -1270,7 +1270,7 @@ def scaled_fp8_quant(
                                 device=input.device,
                                 dtype=torch.float32)
             torch.ops._C.dynamic_per_token_scaled_fp8_quant(
-                output, input, scale, scale_ub)
+                output, input.contiguous(), scale, scale_ub)
         else:
             scale = torch.zeros(1, device=input.device, dtype=torch.float32)
             torch.ops._C.dynamic_scaled_fp8_quant(output, input, scale)
@@ -1379,8 +1379,8 @@ def scaled_int8_quant(
                                dtype=torch.float32)
     input_azp = None if symmetric else torch.empty_like(input_scales,
                                                         dtype=torch.int32)
-    torch.ops._C.dynamic_scaled_int8_quant(output, input, input_scales,
-                                           input_azp)
+    torch.ops._C.dynamic_scaled_int8_quant(output, input.contiguous(),
+                                           input_scales, input_azp)
     return output, input_scales, input_azp