[clang] [clang] CTAD alias: Emit a more descriptive diagnostic message when is_deducible constraint is evaluated to false. (PR #92389)

[Matheus Izvekov via cfe-commits]

mizvekov wrote:

I already fixed this. We just had to constrain the triple, as there are differences in size_t underlying type which affect diagnostics.

https://github.com/llvm/llvm-project/pull/92389