[clang] [clang][ExprConst] Explicitly reject dependent types without diagnostic (PR #108598)

[via cfe-commits]

cor3ntin wrote:

I don't think there is much value in changing the status quo here.
There is evidently a bug somewhere before that code that we should find instead (and then we can replace the existing code by an assert)



https://github.com/llvm/llvm-project/pull/108598