[clang] [llvm] [DirectX] Validate registers are bound to root signature (PR #146785)

[via llvm-commits]

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@@ -945,6 +946,7 @@ class DXILOpLoweringLegacy : public ModulePass {
     AU.addPreserved<DXILResourceWrapperPass>();
     AU.addPreserved<DXILMetadataAnalysisWrapperPass>();
     AU.addPreserved<ShaderFlagsAnalysisWrapper>();
+    AU.addPreserved<RootSignatureAnalysisWrapper>();
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joaosaffran wrote:

This pass, changes the IR, therefore, in order to preserve the data from RootSignatureAnalysisPass, I need to mark it at preserved.

https://github.com/llvm/llvm-project/pull/146785