Reland "[HLSL][RootSignature] Implement parsing of a DescriptorTable with empty clauses" (#133958) This pr relands https://github.com/llvm/llvm-project/pull/133302. It resolves two issues: - Linking error during build, [here](https://github.com/llvm/llvm-project/pull/133302#issuecomment-2767259848). There was a missing dependency for `clangLex` for the `ParseHLSLRootSignatureTest.cpp` unit testing. This library was added to the dependencies to resolve the error. It wasn't caught previously as the library was transitively linked in most build environments - Warning of unused declaration, [here](https://github.com/llvm/llvm-project/pull/133302#issuecomment-2767091368). There was a usability line in `LexHLSLRootSignature.h` of the form `using TokenKind = enum RootSignatureToken::Kind` which causes this error. The declaration is removed from the header file to be used locally in the `.cpp` files that use it. Notably, the original pr would also exposed `clang::hlsl::TokenKind` to everywhere it was included, which had a name clash with `tok::TokenKind`. This is another motivation to change to the proposed resolution. --------- Co-authored-by: Finn Plummer <finnplummer@microsoft.com>
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