Auto merge of #45337 - Zoxc:gen-static, r=nikomatsakis

Immovable generators

This adds support for immovable generators which allow you to borrow local values inside generator across suspension points. These are declared using a `static` keyword:
```rust
let mut generator = static || {
    let local = &Vec::new();
    yield;
    local.push(0i8);
};
generator.resume();

// ERROR moving the generator after it has resumed would invalidate the interior reference
// drop(generator);
```

Region inference is no longer affected by the types stored in generators so the regions inside should be similar to other code (and unaffected by the presence of `yield` expressions). The borrow checker is extended to pick up the slack so interior references still result in errors for movable generators. This fixes #44197, #45259 and #45093.

This PR depends on [PR #44917 (immovable types)](https://github.com/rust-lang/rust/pull/44917), I suggest potential reviewers ignore the first commit as it adds immovable types.

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