[llvm] [DXIL] Adding support to RootSignatureFlags in obj2yaml (PR #122396)

[Damyan Pepper via llvm-commits]

https://github.com/damyanp commented:

Some notes - there's things in here that aren't being used yet, it'd be preferable to not include them if they're not necessary.

It'd be good to get approval from someone more familiar in the obj2yaml / yaml2obj area than I am.

https://github.com/llvm/llvm-project/pull/122396