[clang-tools-extra] [clangd] Include the operator name in documentHighlight (PR #220518)

[Aleksandr Platonov via cfe-commits]

https://github.com/ArcsinX requested changes to this pull request.

clangd crashes on the following example

```cpp
#define PLUS +
struct S { void operator PLU^S(int); };
```

https://github.com/llvm/llvm-project/pull/220518