Target Triple Registry Lookup

I'm trying to write a function that needs to lookup a target triple from the LLVM registry (llvm::TargetRegistry::lookupTarget). I see this in https://llvm.org/doxygen/TargetRegistry_8h_source.html, but not in the bindings (using v100.x.x).

Is the function/module not exposed?

For some context. I'm a LLVM newbie, trying to learn LLVM by porting Gandiva (https://github.com/apache/arrow/tree/master/cpp/src/gandiva) to Rust. There's the below code:

// This method was modified from its original version for a part of MLIR
// Original source from
// https://github.com/llvm/llvm-project/blob/9f2ce5b915a505a5488a5cf91bb0a8efa9ddfff7/mlir/lib/ExecutionEngine/ExecutionEngine.cpp
// The original copyright notice follows.

// 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

static void SetDataLayout(llvm::Module* module) {
  auto target_triple = llvm::sys::getDefaultTargetTriple();
  std::string error_message;
  auto target = llvm::TargetRegistry::lookupTarget(target_triple, error_message);
  if (!target) {
    return;
  }

  std::string cpu(llvm::sys::getHostCPUName());
  llvm::SubtargetFeatures features;
  llvm::StringMap<bool> host_features;

  if (llvm::sys::getHostCPUFeatures(host_features)) {
    for (auto& f : host_features) {
      features.AddFeature(f.first(), f.second);
    }
  }

  std::unique_ptr<llvm::TargetMachine> machine(
      target->createTargetMachine(target_triple, cpu, features.getString(), {}, {}));

  module->setDataLayout(machine->createDataLayout());
}

From the comments on the function, it sounds like llvm::TargetRegistry might be some internal module that's not exposed by default, but I'm currently aiming in the dark.

Thanks