[clang] [analyzer][CTU] Macro expansions for imported translation units (PR #176126)

[Balázs Benics via cfe-commits]

steakhal wrote:

The replies seem to confirm what you were saying. I'll try to come back to this PR and check the parts that I can, and once that is done we can ask for some reviewers for the AST serialisation and deserialisation parts to get proper feedback.
Sorry for this taking so long.

https://github.com/llvm/llvm-project/pull/176126