[clang] [Clang][Sema] Disable checking invalid template id in initializer of primary variable template `std::format_kind` with libstdc++ (PR #139560)

[Younan Zhang via cfe-commits]

zyn0217 wrote:

@cor3ntin @erichkeane I question if a hack is really necessary here. We had run into a similar situation when we broke libstdc++ 14.1 (#92439), and the consensus then was to wait for the next dot release. I'd expect they'll fix this issue in the next dot release too?

@jwakely Will the next GCC release come before Clang 21, i.e. before September?

https://github.com/llvm/llvm-project/pull/139560