[llvm] [DirectX] Replace bitfield version in ProgramHeader. (PR #91797)

[Cooper Partin via llvm-commits]

https://github.com/coopp approved this pull request.

Looks fine to me.  Good idea putting the major and minor version into a single value instead of using bitfields.  Bitfields to make it more readable, but I understand the byte swapping problems you are encountering.

https://github.com/llvm/llvm-project/pull/91797