[clang] [llvm] [DXIL] Remove incompatible metadata types when preparing DXIL. (PR #136386)

[Justin Bogner via cfe-commits]

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@@ -176,6 +185,9 @@ class DXILPrepareModule : public ModulePass {
     VersionTuple ValVer = MetadataInfo.ValidatorVersion;
     bool SkipValidation = ValVer.getMajor() == 0 && ValVer.getMinor() == 0;
 
+    // construct whitelist of valid metadata node kinds
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bogner wrote:

```suggestion
    // construct allowlist of valid metadata node kinds
```

https://github.com/llvm/llvm-project/pull/136386