[clang] [clang-tools-extra] [clang] make concept normalization a SFINAE context (PR #197356)

[Corentin Jabot via cfe-commits]

https://github.com/cor3ntin commented:

Does this fixes https://github.com/llvm/llvm-project/issues/61824 ? (there may be other related issues)

https://github.com/llvm/llvm-project/pull/197356