[clang] [HLSL] Add ByteAddressBuffer definition to HLSLExternalSemaSource #113477 (PR #116699)

[via cfe-commits]

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@@ -1474,6 +1474,11 @@ DeclContext *DeclContext::getPrimaryContext() {
   case Decl::ObjCCategoryImpl:
     return this;
 
+  case Decl::CXXRecord:
+    if (auto *OPD = dyn_cast<CXXRecordDecl>(this))
+      if (auto *Def = OPD->getDefinition())
+        return Def;
+    return this;
   default:
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joaosaffran wrote:

I am not 100% sure, but my understanding is, `ByteAddressBuffer` is the first buffer to not use `addSimpleTemplateParams`. Such method, calls `Builder.addTypeParameter`, which modifies the declaration. 

@bogner  @llvm-beanz, do any of you can correct/confirm this fix, please?

https://github.com/llvm/llvm-project/pull/116699