Arm backend: Add validation steps to op_neg (pytorch#10942)

The validation steps replace the raises that previously verified the
same thing. This reduces duplicated code.

Signed-off-by: Sebastian Larsson <[email protected]>

Author: Sebastian-Larsson

backends/arm/operators/op_neg.py

@@ -16,7 +16,10 @@
     NodeVisitor,
     register_node_visitor,
 )
-
+from executorch.backends.arm.operators.operator_validation_utils import (
+    validate_num_inputs,
+    validate_same_dtype,
+)
 from executorch.backends.arm.tosa_mapping import TosaArg
 
 
@@ -60,14 +63,12 @@ def define_node(
             ts.DType.FP32,
         }
 
+        validate_num_inputs(self.target, inputs, 1)
+        validate_same_dtype(self.target, [*inputs, output])
+
         if inputs[0].dtype not in supported_dtypes:
             raise ValueError(f"Unsupported dtype for NEGATE: {inputs[0].dtype}")
 
-        if inputs[0].dtype != output.dtype:
-            raise ValueError(
-                "All inputs and output need same dtype."
-                f"Got {inputs[0].dtype=}, {output.dtype=}"
-            )
         input_zp, output_zp = get_negate_zero_points(
             node, inputs[0].dtype == ts.DType.INT8
         )
@@ -109,14 +110,12 @@ def define_node(
             ts.DType.FP32,
         }
 
+        validate_num_inputs(self.target, inputs, 1)
+        validate_same_dtype(self.target, [*inputs, output])
+
         if inputs[0].dtype not in supported_dtypes:
             raise ValueError(f"Unsupported dtype for NEGATE: {inputs[0].dtype}")
 
-        if inputs[0].dtype != output.dtype:
-            raise ValueError(
-                "All inputs and output need same dtype."
-                f"Got {inputs[0].dtype=}, {output.dtype=}"
-            )
         input_zp, output_zp = get_negate_zero_points(
             node, inputs[0].dtype == ts.DType.INT8
         )