[clang] [clang][ASTMatcher] Add matchers for CXXFoldExpr (PR #71245)

[Piotr Zegar via cfe-commits]

https://github.com/PiotrZSL commented:

Overall looks fine, but I didn't check test too deeply.
Someone said not so long ago that we do not want to add matchers unless there is some usecase for them in some of the tools. Pull request doesn't say anything.
Whats a purpose of those matchers (except only to have them).


https://github.com/llvm/llvm-project/pull/71245