[PATCH] D102149: [analyzer][ctu] Allow loading invocation list from a compilation database automatically detected from the ctu-dir

[Ella Ma via Phabricator via cfe-commits]

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It seems to be simpler and more convenient to reuse the compilation database generated for ClangTool when using clang-check to run the analyzer.
In this patch, when the invocation list file is failed to be loaded, the ASTLoader will try to find a compilation database from the `ctu-dir` and convert the detected database to an invocation list.

For each compile command objects in the database:

- the "directory" entry is converted to option `-working-directory` appended to the invocation commands;
- the "file" entry is updated to an absolute path based on the "directory" entry as the index;
- and the "command" entry is converted to the invocation commands.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D102149

Files:
  clang/include/clang/CrossTU/CrossTranslationUnit.h
  clang/lib/CrossTU/CMakeLists.txt
  clang/lib/CrossTU/CrossTranslationUnit.cpp
  clang/test/Analysis/ctu-on-demand-parsing.c
  clang/test/Analysis/ctu-on-demand-parsing.cpp

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