Jon Ross-Perkins 0b340a2ed2 Update parse tree yaml for multi-file. (#3215) ...

Building on #3214, updates parse tree yaml to be:

```
- filename: name
  parse_tree: [ ... ]
```

2023-09-13 16:35:15 +00:00

..

const_pointer.carbon

Update parse tree yaml for multi-file. (#3215)

2023-09-13 16:35:15 +00:00

fail_pointer_type_in_expression.carbon

Update parse tree yaml for multi-file. (#3215)

2023-09-13 16:35:15 +00:00

pointer_type.carbon

Update parse tree yaml for multi-file. (#3215)

2023-09-13 16:35:15 +00:00

pointer_value.carbon

Update parse tree yaml for multi-file. (#3215)

2023-09-13 16:35:15 +00:00