[clang] [C23] No longer assert on huge enumerator values (PR #81760)

[Eli Friedman via cfe-commits]

https://github.com/efriedma-quic approved this pull request.

LGTM

Note you can get a similar crash using `enum x { X = (__uint128_t)(1<<64) };`.  I'm a little surprised we haven't run into this before C23.

https://github.com/llvm/llvm-project/pull/81760