[PATCH] D128679: [pseudo] Define a clangPseudoCLI library.

[Haojian Wu via Phabricator via cfe-commits]

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- define a common data structure ParseLang which is a compiled result of the bnf grammar. It is defined in ParseLang.h;
- creates a clangPseudoCLI lib which defines a `grammar` commandline flag and expose a function to get the ParseLang. It supports --grammar=cxx, --grammmar=/path/to/file.bnf;
- Use the clangPseudoCLI in clang-pseudo, fuzzer, and benchmark tools (simplify the code and use the prebuilt cxx grammar);

Split out from https://reviews.llvm.org/D127448 with comments addressed


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D128679

Files:
  clang-tools-extra/pseudo/benchmarks/Benchmark.cpp
  clang-tools-extra/pseudo/benchmarks/CMakeLists.txt
  clang-tools-extra/pseudo/fuzzer/CMakeLists.txt
  clang-tools-extra/pseudo/fuzzer/Fuzzer.cpp
  clang-tools-extra/pseudo/include/clang-pseudo/GLR.h
  clang-tools-extra/pseudo/include/clang-pseudo/ParseLang.h
  clang-tools-extra/pseudo/include/clang-pseudo/cli/CLI.h
  clang-tools-extra/pseudo/include/clang-pseudo/cxx/CXX.h
  clang-tools-extra/pseudo/lib/CMakeLists.txt
  clang-tools-extra/pseudo/lib/cli/CLI.cpp
  clang-tools-extra/pseudo/lib/cli/CMakeLists.txt
  clang-tools-extra/pseudo/lib/cxx/CXX.cpp
  clang-tools-extra/pseudo/tool/CMakeLists.txt
  clang-tools-extra/pseudo/tool/ClangPseudo.cpp
  clang-tools-extra/pseudo/unittests/GLRTest.cpp

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