[clang] [Clang] Add __ugly__ spelling for the msvc attribute scope (PR #113765)

[Erich Keane via cfe-commits]

https://github.com/erichkeane commented:

My only hold up is that we don't really own the design space.  If @StephanTLavavej /Microsoft can assert us that this is the spelling they are going with, I'm all for it.

https://github.com/llvm/llvm-project/pull/113765