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

[Justin Bogner via llvm-commits]

================
@@ -116,6 +116,29 @@ template <typename T> struct ViewArray {
 };
 
 namespace DirectX {
+
+class RootSignature {
+private:
+  StringRef Data;
+  uint32_t Version;
+  uint32_t NumParameters;
+  uint32_t RootParametersOffset;
+  uint32_t NumStaticSamplers;
+  uint32_t StaticSamplersOffset;
+  uint32_t Flags;
+
+public:
+  RootSignature(StringRef Data) : Data(Data) {}
+
+  Error parse();
----------------
bogner wrote:

It's a bit awkward to have the invariant that a user must call `parse` immediately after construction for this object to be valid. I would probably opt for making the constructor private and adding a factory method to parse a valid object, so something like:
```
  static Expected<RootSignature> parse(StringRef Data);
```

Also, do we actually need to store the reference to the string in the root signature object? Would just having the parsed integer values be sufficient?

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