[lld] [clang] [llvm] [lldb] [clang-tools-extra] [libc] [compiler-rt] [libcxx] [flang] [concepts] Set up an instantiation scope for constraint expression comparison (PR #79698)

[Younan Zhang via cfe-commits]

https://github.com/zyn0217 closed https://github.com/llvm/llvm-project/pull/79698