Continue to get rid of `ty::Const::{try_}eval*` This PR mostly does: * Removes all of the `try_eval_*` and `eval_*` helpers from `ty::Const`, and replace their usages with `try_to_*`. * Remove `ty::Const::eval`. * Rename `ty::Const::normalize` to `ty::Const::normalize_internal`. This function is still used in the normalization code itself. * Fix some weirdness around the `TransmuteFrom` goal. I'm happy to split it out further; for example, I could probably land the first part which removes the helpers, or the changes to codegen which are more obvious than the changes to tools. r? BoxyUwU Part of https://github.com/rust-lang/rust/issues/130704