Rollup merge of #94810 - michaelwoerister:fix-trait-pointer-debuginfo-names, r=wesley...

Rollup merge of #94810 - michaelwoerister:fix-trait-pointer-debuginfo-names, r=wesleywiser

debuginfo: Fix bug in type name generation for dyn types with associated types but no other generic arguments.

For types like `&dyn Future<Output=bool>` the compiler currently emits invalid types names in debuginfo. This PR fixes this.

Before:
```txt
// DWARF
&dyn core::future::future::Future, Output=bool>

// CodeView
ref$<dyn$<core::future::future::Future,assoc$<Output,bool> > > >
```

After:
```txt
// DWARF
&dyn core::future::future::Future<Output=bool>

// CodeView
ref$<dyn$<core::future::future::Future<assoc$<Output,bool> > > >
```

These syntactically incorrect type names can cause downstream tools (e.g. debugger extensions) crash when trying to parse them.

r? `@wesleywiser`