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

[Stephan T. Lavavej via cfe-commits]

StephanTLavavej wrote:

Yeah, it would be great if C1XX (MSVC's frontend) supported `__meow__` as a synonym for `meow`.

I've occasionally gone into the FE and just implemented features; this one might be within my reach.

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