[ROCm][inductor] Additional pointwise tunings (#2642)

This config improves the performance of a 1D pointwise kernel by 20% as
measured on MI350.

(cherry picked from commit a7bac0a)

Author: naromero77amd

torch/_inductor/runtime/triton_heuristics.py

@@ -2529,6 +2529,15 @@ def pointwise(
                 ),
                 *hinted_configs,
             ]
+            # Additional reduction configs appended for ROCm builds
+            if torch.version.hip:
+                configs.append(triton_config_with_settings(
+                    size_hints,
+                    2048,
+                    num_warps=8,
+                    num_stages=2,
+                    waves_per_eu=1
+                )) # 20% improvement
     if len(size_hints) == 2:
         if (
             disable_pointwise_autotuning(inductor_meta) # or tile_hint == TileHint.SQUARE