Fix lld build on Windows with MSVC due to C2461

- It seems the same name of class and one of its fields confuses MSVC,
  https://docs.microsoft.com/en-us/cpp/error-messages/compiler-errors-1/compiler-error-c2461?view=vs-2019
- Patch from Andryeyev, German <german.andryeyev@amd.com>

llvm-svn: 364567