Rollup merge of #115300 - spastorino:smir-tweaks, r=oli-obk

Tweaks and improvements on SMIR around generics_of and predicates_of

r? `@oli-obk`

This allows an API like the following ...

```rust
    let trait_decls = stable_mir::all_trait_decls().iter().map(|trait_def| {
        let trait_decl = stable_mir::trait_decl(trait_def);
        let generics = trait_decl.generics_of();
        let predicates = trait_decl.predicates_of().predicates;
```

I didn't like that much `trait_def.trait_decl()` which is it possible but adding a method to a def_id that loads up a whole trait definition looks backwards to me.

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