[llvm] [DirectX backend] emits metadata for DXIL version. (PR #88350)

[Damyan Pepper via llvm-commits]

damyanp wrote:

> Default to DXIL 1.0

Can you clarify what the intent of this PR is please?  It looks like it is actually trying to match current DXC behavior that assumes that the DXIL version is tied to the SM version?

https://github.com/llvm/llvm-project/pull/88350