[clang] [clang-tools-extra] [clang] Fix LogDiagnosticPrinter.h and ClangTidyPlugin.cpp after 9e306ad4 (PR #141131)

[Kazu Hirata via cfe-commits]

kazutakahirata wrote:

@jansvoboda11 With this PR, I still see:

```
clang/lib/Frontend/LogDiagnosticPrinter.cpp:24:7: error: member initializer 'DiagOpts' does not name a non-static data member or base class
   24 |       DiagOpts(DiagOpts) {}
      |       ^~~~~~~~~~~~~~~~~~
```

Would you mind taking a look?


https://github.com/llvm/llvm-project/pull/141131