Add optional static registration for mhlo/lmhlo passes.

PiperOrigin-RevId: 324190465

lib/Dialect/mhlo/transforms/register_all_passes.cc

@@ -0,0 +1,28 @@
+/* Copyright 2020 The TensorFlow Authors. All Rights Reserved.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+==============================================================================*/
+
+#include "mlir-hlo/Dialect/mhlo/transforms/register_passes.h"
+
+namespace mlir {
+
+namespace {
+
+bool register_all_passes = ([] {
+    mhlo::registerAllMhloPasses();
+  lmhlo::registerAllLmhloPasses();
+}(), true);
+
+}  // namespace
+}  // namespace mlir