[clang] disable unary, vector mask (PR #130400)

[Aaron Ballman via cfe-commits]

AaronBallman wrote:

The current behavior seems to be intentional, at least it was added as part of 1fa36050abd8b798927829f0b0a4362f9e9c63eb which was solving https://github.com/llvm/llvm-project/issues/12837. CC @efriedma-quic 

https://github.com/llvm/llvm-project/pull/130400