[PATCH] D147251: [Chkpnt] Initial patch for checkpointing.

[Vasileios Porpodas via Phabricator via llvm-commits]

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Checkpointing was discussed in a couple of RFCs:
https://discourse.llvm.org/t/rfc-local-per-component-ir-checkpointing/69071
https://discourse.llvm.org/t/rfc-lightweight-llvm-ir-checkpointing/68446
This set of patches implement the former local per-component checkpointing.
In short checkpointing provides a simple API for saving and restoring parts
of the IR state. For example if we want to save/restore the state of BB:

  auto Chkpnt = Context.getCheckpoint();
  Chkpnt.track(BB);
  // Make changes to instructions in `BB`
  Chkpnt.restore();

This patch includes the main body of the checkpointing infrastructure and also
implements part of tracking name changes of a BasicBlock component.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D147251

Files:
  llvm/include/llvm/IR/BasicBlock.h
  llvm/include/llvm/IR/Checkpoint.h
  llvm/include/llvm/IR/CheckpointChanges.h
  llvm/include/llvm/IR/CheckpointCommon.h
  llvm/include/llvm/IR/CheckpointTracker.h
  llvm/include/llvm/IR/LLVMContext.h
  llvm/include/llvm/IR/Value.h
  llvm/lib/IR/CMakeLists.txt
  llvm/lib/IR/Checkpoint.cpp
  llvm/lib/IR/CheckpointChanges.cpp
  llvm/lib/IR/CheckpointCommon.cpp
  llvm/lib/IR/CheckpointTracker.cpp
  llvm/lib/IR/LLVMContext.cpp
  llvm/lib/IR/Value.cpp
  llvm/unittests/IR/CMakeLists.txt
  llvm/unittests/IR/CheckpointTest.cpp

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