fix: add inplace fmod benchmarks

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: factnn

benchmark/test_fmod_perf.py

@@ -37,3 +37,25 @@ def test_perf_fmod_scalar():
         dtypes=FLOAT_DTYPES,
     )
     bench.run()
+
+
+@pytest.mark.fmod
+def test_perf_fmod_inplace():
+    bench = GenericBenchmark(
+        input_fn=fmod_input_fn,
+        op_name="fmod_",
+        torch_op=torch.Tensor.fmod_,
+        dtypes=FLOAT_DTYPES,
+    )
+    bench.run()
+
+
+@pytest.mark.fmod
+def test_perf_fmod_inplace_scalar():
+    bench = GenericBenchmark(
+        input_fn=fmod_scalar_input_fn,
+        op_name="fmod_.Scalar",
+        torch_op=torch.Tensor.fmod_,
+        dtypes=FLOAT_DTYPES,
+    )
+    bench.run()