[llvm] [DXIL] Adding support to RootSignatureFlags in obj2yaml (PR #122396)

[Chris B via llvm-commits]

================
@@ -541,6 +548,21 @@ struct ProgramSignatureElement {
 static_assert(sizeof(ProgramSignatureElement) == 32,
               "ProgramSignatureElement is misaligned");
 
+struct RootSignatureValidations {
+
+  static Expected<uint32_t> validateRootFlag(uint32_t Flags) {
+    if ((Flags & ~0x80000fff) != 0)
+      return llvm::make_error<BinaryStreamError>("Invalid flag");
----------------
llvm-beanz wrote:

```suggestion
      return llvm::make_error<BinaryStreamError>("Invalid Root Signature flag");
```

https://github.com/llvm/llvm-project/pull/122396