9ec5afea77
`HLSLRootSignature.h` was originally created to hold the struct definitions of an `llvm::hlsl::rootsig::RootElement` and some helper functions for it. However, there many users of the structs that don't require any of the helper methods. This requires us to link the `FrontendHLSL` library, where we otherwise wouldn't need to. For instance: - This [revert](https://github.com/llvm/llvm-project/pull/142005) was required as it requires linking to the unrequired `FrontendHLSL` library - As part of the change required here: https://github.com/llvm/llvm-project/issues/126557. We will want to add an `HLSLRootSignatureVersion` enum. Ideally this could live with the root signature struct defs, but we don't want to link the helper objects into `clang/Basic/TargetOptions.h` This change allows the struct definitions to be kept in a single header file and to then have the `FrontendHLSL` library only be linked when required.
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