Rollup merge of #123919 - RalfJung:discriminant, r=compiler-errors

builtin-derive: tag → discriminant

As far as I can tell, all of this operates on the discriminant, not the tag. After all, with something like `Option<&T>`, the "tag" of the `Some` variant is basically just the reference value, which is never what you want to compare when figuring out which variant the enum is in.

See [here](https://rustc-dev-guide.rust-lang.org/appendix/glossary.html) for an explanation of the difference between tag and discriminant.

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