[clang] [clang-tools-extra] [clang-tidy] Avoid processing declarations in system headers (PR #128150)

[Carlos Galvez via cfe-commits]

carlosgalvezp wrote:

Btw I found [this commit](https://github.com/llvm/llvm-project/commit/814e7974c64c977960c4913a117bf59af005865b) which seemed to be intended at setting the basis for running clang-tidy on a reduced AST, and where the `ParentMap` class was created.

@sam-mccall Perhaps you have good ideas on how this problem can be solved best?




https://github.com/llvm/llvm-project/pull/128150