[clang-tools-extra] [clang-tidy] Make `modernize-use-using`'s fix-its more robust (PR #149694)

[Victor Chernyakin via cfe-commits]

localspook wrote:

Nope; that's the preexisting issue I mention in the description. I believe fixing it in the general case would require Clang to provide extra information in `TypedefDecl`, something like a `SourceRange DeclSpecSeqRange`:
```cpp
typedef const int *ptr1, *ptr2;
        ^^^^^^^^^
```

https://github.com/llvm/llvm-project/pull/149694