Rollup merge of #45751 - estebank:issue-44684, r=nikomatsakis

Handle anon lifetime arg being returned with named lifetime return type

When there's a lifetime mismatch between an argument with an anonymous
lifetime being returned in a method with a return type that has a named
lifetime, show specialized lifetime error pointing at argument with a
hint to give it an explicit lifetime matching the return type.

```
error[E0621]: explicit lifetime required in the type of `other`
  --> file2.rs:21:21
   |
17 |     fn bar(&self, other: Foo) -> Foo<'a> {
   |                   ----- consider changing the type of `other` to `Foo<'a>`
...
21 |                     other
   |                     ^^^^^ lifetime `'a` required
```

Follow up to #44124 and #42669. Fix #44684.

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