[llvm] [DirectX] Adding support for Root Descriptors in obj2yaml/yaml2obj (PR #137259)

[Sarah Spall via llvm-commits]

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@@ -580,7 +585,28 @@ struct ProgramSignatureElement {
 
 static_assert(sizeof(ProgramSignatureElement) == 32,
               "ProgramSignatureElement is misaligned");
+namespace RST0 {
+namespace v0 {
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spall wrote:

Why use namespaces to distinguish these structs and not give them different names like 'RootDescriptorV1' and 'RootDescriptorV2'?

https://github.com/llvm/llvm-project/pull/137259