Rollup merge of #61702 - RalfJung:const-enum-cast, r=oli-obk

test more variants of enum-int-casting

As I learned in https://github.com/rust-lang/rust/pull/61673#issuecomment-500213506, there is a code path we are not testing yet. Looks like enum-int-casting with and without an intermediate let-binding is totally different.

EDIT: The reason for this is to get rid of the cycle in definitions such as:
```rust
enum Foo {
    A = 0,
    B = Foo::A as isize + 2,
}
```
This has historically been supported, so a hack adding special treatment to `Enum::Variant as _` was added to keep supporting it.

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