fix: const eval cast of single-variant enum - #23185
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This isn't the correct way to fix that. It should be fixed during MIR lowering, see the corresponding code in rustc: https://github.com/rust-lang/rust/blob/e71c0f1e3395b10a8c331317be1a5c107bdf7b2e/compiler/rustc_mir_build/src/builder/expr/as_rvalue.rs#L125-L163.
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Single-variant enum incorrectly evaluated to 0. The fix computes the discriminant via
const_eval_discriminantin theIntToIntcasting.Fixes #23148)