Rollup merge of #99340 - GoldsteinE:fix-localdefid-debug-ice, r=lcnr

Fix ICE in Definitions::create_def

`Debug` implementation for `LocalDefId` uses global `Definitions`. Normally it’s ok, but we can’t do it while holding a mutable reference to `Definitions`, since it causes ICE or deadlock (depending on whether `parallel_compiler` is enabled).

This PR effectively copies the `Debug` implementation into the problematic method. I don’t particularly love this solution (since it creates code duplication), but I don’t see any other options.

This issue was discovered when running `rustdoc` with `RUSTDOC_LOG=trace` on the following file:
```rust
pub struct SomeStruct;

fn asdf() {
    impl SomeStruct {
        pub fn qwop(&self) {
            println!("hidden function");
        }
    }
}
```

I’m not sure how to create a test for this behavior.

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