[clang] [compiler-rt] [clang][UBSan] Add implicit conversion check for bitfields (PR #75481)

[Axel Lundberg via llvm-commits]

Zonotora wrote:

> Also, I don't have commit access (first PR here), someone has to commit on my behalf!

@AaronBallman 

https://github.com/llvm/llvm-project/pull/75481