[llvm] [DXIL] Add support for root signature flag element in DXContainer (PR #123147)

[via llvm-commits]

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@@ -95,8 +92,14 @@ static bool parse(LLVMContext *Ctx, ModuleRootSignature *MRS, NamedMDNode *Root,
       continue;
     }
 
+    const MDOperand &FunctionPointerMdNode = Node->getOperand(0);
+    if (FunctionPointerMdNode == nullptr) {
+      // Function was pruned during compilation.
+      continue;
+    }
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joaosaffran wrote:

This seems expected, not used functions will be removed, since we record function pointers in the metadata, if the function is removed the pointer will be null. @bogner please correct me.

I think we should clean it, but we might need to do it in another pass.

https://github.com/llvm/llvm-project/pull/123147