Refactor unwind in MIR
This makes unwinding from current `Option<BasicBlock>` into
```rust
enum UnwindAction {
Continue,
Cleanup(BasicBlock),
Unreachable,
Terminate,
}
```
cc `@JakobDegen` `@RalfJung` `@Amanieu`
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| .. | ||
| const_eval | ||
| interpret | ||
| transform | ||
| util | ||
| errors.rs | ||
| lib.rs | ||