[PATCH] D122139: [pseudo] Introduce parse forest.

[Haojian Wu via Phabricator via cfe-commits]

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Parse forest is the output of the GLR parser, it is a tree-like DAG
which presents all possible parse trees without duplicating subparse structures.

This is a patch split from https://reviews.llvm.org/D121150.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D122139

Files:
  clang-tools-extra/pseudo/include/clang-pseudo/Forest.h
  clang-tools-extra/pseudo/lib/CMakeLists.txt
  clang-tools-extra/pseudo/lib/Forest.cpp
  clang-tools-extra/pseudo/unittests/CMakeLists.txt
  clang-tools-extra/pseudo/unittests/ForestTest.cpp

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