[llvm] [DirectX] Delay converting to old-style debug info (PR #201336)

[Harald van Dijk via llvm-commits]

hvdijk wrote:

> LGTM but it's a bit awkward to leave the definition of getNonDXILAttributeMask in DXILPrepare.cpp - we don't really have a better place for it though. Do you think it's worth adding a new .cpp file just for this function?

I agree it's not ideal, but like you I also don't see a better place for it. My thinking at the moment it doesn't really do any harm, and until we get more utility functions, I won't know if this should be one general `DirectXUtils.cpp`, or something split up further. I'm thinking we're best off leaving it as it is for now.

https://github.com/llvm/llvm-project/pull/201336