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

[Axel Lundberg via cfe-commits]

Zonotora wrote:

@rjmccall fixed feedback

> You should handle compound assignments.

I believe I already support compound assignments (and PrePostIncDec), if I am not missing something? :smiley: 


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