[mlir][transform][gpu][python] Add .td file for bindings.

[ingomueller-net]

Rebasing to latest main. (This includes a change due to https://reviews.llvm.org/D154469.)

[ingomueller-net]

Rebasing to resolve unrelated build failures.

mlir/python/CMakeLists.txt

declare_mlir_dialect_extension_python_bindings(
   SOURCES
     dialects/transform/bufferization.py
   DIALECT_NAME transform
   EXTENSION_NAME bufferization_transform)
 
 declare_mlir_dialect_extension_python_bindings(
   ADD_TO_PARENT MLIRPythonSources.Dialects
   ROOT_DIR "${CMAKE_CURRENT_SOURCE_DIR}/mlir"
+  TD_FILE dialects/GPUTransformOps.td
+  SOURCES
+    dialects/transform/gpu.py
+  DIALECT_NAME transform
+  EXTENSION_NAME gpu_transform)
+
+declare_mlir_dialect_extension_python_bindings(
+  ADD_TO_PARENT MLIRPythonSources.Dialects
+  ROOT_DIR "${CMAKE_CURRENT_SOURCE_DIR}/mlir"
   TD_FILE dialects/SCFLoopTransformOps.td
   SOURCES
     dialects/_loop_transform_ops_ext.py
     dialects/transform/loop.py
   DIALECT_NAME transform
   EXTENSION_NAME loop_transform)
 
 declare_mlir_dialect_extension_python_bindings(

mlir/python/mlir/dialects/GPUTransformOps.td

+//===-- GPUTransformOps.td ---------------------------------*- tablegen -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+//
+// Entry point of the Python bindings generator for the transform ops provided
+// by the GPU dialect.
+//
+//===----------------------------------------------------------------------===//
+
+
+#ifndef PYTHON_BINDINGS_GPU_TRANSFORM_OPS
+#define PYTHON_BINDINGS_GPU_TRANSFORM_OPS
+
+include "mlir/Dialect/GPU/TransformOps/GPUTransformOps.td"
+
+#endif // PYTHON_BINDINGS_GPU_TRANSFORM_OPS

mlir/python/mlir/dialects/transform/gpu.py

+#  Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+#  See https://llvm.org/LICENSE.txt for license information.
+#  SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+
+from .._gpu_transform_ops_gen import *