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

[Justin Bogner via llvm-commits]

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

We should at least spell it correctly (`RTS0`)

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