[llvm] [DXIL][Analysis] Add validator version to info collected by Module Metadata Analysis (PR #104828)

[S. Bharadwaj Yadavalli via llvm-commits]

================
@@ -25,6 +25,14 @@ static ModuleMetadataInfo collectMetadataInfo(Module &M) {
   MMDAI.DXILVersion = TT.getDXILVersion();
   MMDAI.ShaderModelVersion = TT.getOSVersion();
   MMDAI.ShaderStage = TT.getEnvironment();
+  NamedMDNode *ValidatorVerNode = M.getNamedMetadata("dx.valver");
+  if (ValidatorVerNode) {
+    auto *ValVerMD = cast<MDNode>(ValidatorVerNode->getOperand(0));
+    auto *MajorMD = mdconst::extract<ConstantInt>(ValVerMD->getOperand(0));
+    auto *MinorMD = mdconst::extract<ConstantInt>(ValVerMD->getOperand(1));
+    MMDAI.ValidatorVersion =
+        VersionTuple(MajorMD->getZExtValue(), MinorMD->getZExtValue());
+  }
----------------
bharadwajy wrote:

> Shall we report error when `dx.valver` not exist?

Since this is an analysis pass, the thought behind **not** reporting an error here but just retaining the default value of `{}`, is to allow for the consumer of the analysis information the option of emitting an error, emitting a warning or may be setting the validator version, depending on the usage context. 

https://github.com/llvm/llvm-project/pull/104828