[clang] [Clang] Fix evaluation of fold expanded constraints for NTTP (PR #210005)

[Younan Zhang via cfe-commits]

zyn0217 wrote:

> LGTM. Did you forget the release note or do you intend to backport?

Yes, let's backport it with another fix which introduces transform of NTTP together.


https://github.com/llvm/llvm-project/pull/210005