[llvm] [DX] Support pipeline state masks (PR #66425)

[Justin Bogner via llvm-commits]

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@@ -51,6 +51,18 @@ struct PSVRuntimeInfo {
   SmallVector<PSVSignatureElement> OutputElements;
   SmallVector<PSVSignatureElement> PatchOrPrimElements;
 
+  // The interface here is bad, and we'll want to change this in the future. We
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bogner wrote:

Probably worth putting `TODO:` in this comment

https://github.com/llvm/llvm-project/pull/66425