[clang] [llvm] [HLSL][RootSignature] Implement parsing of a DescriptorTable with empty clauses (PR #133302)

[Justin Bogner via cfe-commits]

https://github.com/bogner commented:

One comment saying you should rename all of the methods in this patch and a few small suggestions, but this is looking pretty close

https://github.com/llvm/llvm-project/pull/133302