[llvm-branch-commits] [clang] [clang][test] add testing for the AST matcher reference (PR #94248)

[Julian Schmidt via llvm-branch-commits]

5chmidti wrote:

- added a file-level comment in the ASTMatcher.h file on how the syntax works (basically the pr description)
- replaced some `type=name` matches with explicit code matches where applicable, to be more expressive
- added comments to `count=` matches when they didn't explain why or if there were multiple matches

https://github.com/llvm/llvm-project/pull/94248