[llvm] [HLSL] Add descriptor table metadata parsing (PR #142492)

[Justin Bogner via llvm-commits]

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@@ -174,6 +174,94 @@ static bool parseRootDescriptors(LLVMContext *Ctx,
   return false;
 }
 
+static bool parseDescriptorRange(LLVMContext *Ctx,
+                                 mcdxbc::RootSignatureDesc &RSD,
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bogner wrote:

Why is RSD passed in here?

https://github.com/llvm/llvm-project/pull/142492