message: Remove the use of the global dialect registry in tf-mlir-translate (NFC)
  We've been moving to explicit registration for every users.
diff: @@ -111,8 +111,6 @@ int main(int argc, char** argv) {
  if (import_saved_model_object_graph) {
  mlir::MLIRContext context;
  - context.loadAllGloballyRegisteredDialects();
  -
  auto module_or = tensorflow::SavedModelObjectGraphToMlirImport(
  input_filename, tags, exported_names, &context);
  if (!module_or.status().ok()) return 1;
  @@ -120,8 +118,6 @@ int main(int argc, char** argv) {
  module_or.ConsumeValueOrDie()->print(output->os());
  } else if (import_saved_model_signature_defs) {
  mlir::MLIRContext context;
  - context.loadAllGloballyRegisteredDialects();
  -
  auto module_or = tensorflow::SavedModelSignatureDefsToMlirImport(
  input_filename, tags, exported_names, &context, upgrade_legacy);
  if (!module_or.status().ok()) return 1;
  @@ -141,7 +137,6 @@ int main(int argc, char** argv) {
  llvm::SourceMgr sourceMgr;
  sourceMgr.AddNewSourceBuffer(std::move(ownedBuffer), llvm::SMLoc());
  mlir::MLIRContext context;
  - context.loadAllGloballyRegisteredDialects();
  mlir::SourceMgrDiagnosticHandler diagnostic_handler(sourceMgr, &context);
  return (*requested_translation)(sourceMgr, os, &context);
  };
  