[clang] [HLSL][RootSignature] Add bounded parameter validations of Root Elements for non-flag values (PR #145795)

[Finn Plummer via cfe-commits]

inbelic wrote:

This pr have been converted to a draft until https://github.com/llvm/llvm-project/issues/145940 and https://github.com/llvm/llvm-project/issues/145815 are resolved and the logic can be re-used.

https://github.com/llvm/llvm-project/pull/145795